[#6643] Disable optimizations for debug build

Summary:
Some time ago we had optimizations disabled for debug build type, but it was enabled during fix of #1291: f710367 ( https://phabricator.dev.yugabyte.com/D6660 ). Now we no longer have `retryable_rpc_single_call_timeout_ms` flag, also optimizations in debug build make it harder to investigate issues because of optimized stack traces and variables. So, we can disable these optimizations again to make debugging easier.

Before (note <optimized out> values that are not available for debugging):
```
(gdb) bt
#0  0x00007f97990bfa6b in raise (sig=sig@entry=11) at ../sysdeps/unix/sysv/linux/pt-raise.c:35
#1  0x00007f97a45268b9 in AddHash (num_probes=6, total_bits=523776, num_lines=<optimized out>, data=0x2bdc000 "", h=4266458700) at ../../src/yb/rocksdb/util/bloom.cc:66
#2  rocksdb::(anonymous namespace)::FixedSizeFilterBitsBuilder::AddKey (this=<optimized out>, key=...) at ../../src/yb/rocksdb/util/bloom.cc:463
#3  0x00007f97a44f0818 in rocksdb::FixedSizeFilterBlockBuilder::AddKey (this=this@entry=0x1c87a40, key=...) at ../../src/yb/rocksdb/table/fixed_size_filter_block.cc:97
#4  0x00007f97a44f08b0 in rocksdb::FixedSizeFilterBlockBuilder::Add (this=0x1c87a40, key=...) at ../../src/yb/rocksdb/table/fixed_size_filter_block.cc:91
#5  0x00007f97a44cf295 in rocksdb::BlockBasedTableBuilder::Add (this=0x1cd1c00, key=..., value=...) at ../../src/yb/rocksdb/table/block_based_table_builder.cc:468
#6  0x00007f97a439b9a4 in rocksdb::BuildTable (dbname=..., env=0x7f97a48a2c00 <rocksdb::Env::Default()::default_env>, ioptions=..., env_options=..., table_cache=0x1ccf740, iter=0x7f97969858f8, meta=0x7f97969864a0, internal_comparator=
    std::shared_ptr<const rocksdb::InternalKeyComparator> (use count 3, weak count 0) = {...}, int_tbl_prop_collector_factories=std::vector of length 1, capacity 1 = {...}, column_family_id=0,
    snapshots=std::vector of length 0, capacity 0, earliest_write_conflict_snapshot=72057594037927935, compression=rocksdb::kSnappyCompression, compression_opts=..., paranoid_file_checks=false, internal_stats=0x1d40200,
    boundary_values_extractor=0x1cd03f0, io_priority=rocksdb::Env::IO_HIGH, table_properties=0x7f9796987000) at ../../src/yb/rocksdb/db/builder.cc:160
#7  0x00007f97a4444ced in rocksdb::FlushJob::WriteLevel0Table (this=this@entry=0x7f9796986f40, mems=..., edit=0x1d44268, meta=meta@entry=0x7f97969864a0) at ../../src/yb/rocksdb/db/flush_job.cc:290
#8  0x00007f97a444669c in rocksdb::FlushJob::Run (this=this@entry=0x7f9796986f40, file_meta=file_meta@entry=0x7f9796986d00) at ../../src/yb/rocksdb/db/flush_job.cc:191
#9  0x00007f97a43fb5ba in rocksdb::DBImpl::FlushMemTableToOutputFile (this=this@entry=0x1d24000, cfd=cfd@entry=0x1a7b000, mutable_cf_options=..., made_progress=made_progress@entry=0x7f9796987f47,
    job_context=job_context@entry=0x7f9796987d70, log_buffer=0x7f9796987480) at ../../src/yb/rocksdb/db/db_impl.cc:1873
#10 0x00007f97a43fc505 in rocksdb::DBImpl::BackgroundFlush (this=this@entry=0x1d24000, made_progress=made_progress@entry=0x7f9796987f47, job_context=job_context@entry=0x7f9796987d70, log_buffer=log_buffer@entry=0x7f9796987480,
    cfd=0x1a7b000, cfd@entry=0x0) at ../../src/yb/rocksdb/db/db_impl.cc:3202
#11 0x00007f97a4406cb3 in rocksdb::DBImpl::BackgroundCallFlush (this=this@entry=0x1d24000, cfd=cfd@entry=0x0) at ../../src/yb/rocksdb/db/db_impl.cc:3276
#12 0x00007f97a4406f6d in rocksdb::DBImpl::BGWorkFlush (db=db@entry=0x1d24000) at ../../src/yb/rocksdb/db/db_impl.cc:3132
#13 0x00007f97a4540875 in rocksdb::ThreadPool::BGThread (this=0x1adeb60, thread_id=0) at ../../src/yb/rocksdb/util/thread_posix.cc:126
#14 0x00007f97a4540899 in operator() (__closure=<optimized out>) at ../../src/yb/rocksdb/util/thread_posix.cc:165
#15 std::_Function_handler<void(), rocksdb::ThreadPool::StartBGThreads()::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...)
    at /opt/yb-build/brew/linuxbrew-20181203T161736v9-3ba4c2ed9b0587040949a4a9a95b576f520bae/Cellar/gcc/5.5.0_4/include/c++/5.5.0/functional:1871
#16 0x00007f979d804626 in operator() (this=0x1cbdc78) at /opt/yb-build/brew/linuxbrew-20181203T161736v9-3ba4c2ed9b0587040949a4a9a95b576f520bae/Cellar/gcc/5.5.0_4/include/c++/5.5.0/functional:2267
#17 yb::Thread::SuperviseThread (arg=0x1cbdc20) at ../../src/yb/util/thread.cc:771
#18 0x00007f97990b7694 in start_thread (arg=0x7f9796990700) at pthread_create.c:333
#19 0x00007f9798df941d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
```

After:
```
#0  0x00007f1a9109ba6b in raise (sig=11) at ../sysdeps/unix/sysv/linux/pt-raise.c:35
#1  0x00007f1a9edd7343 in rocksdb::(anonymous namespace)::AddHash (h=4266458700, data=0x2d58000 "", num_lines=1023, total_bits=523776, num_probes=6) at ../../src/yb/rocksdb/util/bloom.cc:66
#2  0x00007f1a9edd87c8 in rocksdb::(anonymous namespace)::FixedSizeFilterBitsBuilder::AddKey (this=0x2d30040, key=...) at ../../src/yb/rocksdb/util/bloom.cc:463
#3  0x00007f1a9ed8e757 in rocksdb::FixedSizeFilterBlockBuilder::AddKey (this=0x1ef22d0, key=...) at ../../src/yb/rocksdb/table/fixed_size_filter_block.cc:97
#4  0x00007f1a9ed8e6eb in rocksdb::FixedSizeFilterBlockBuilder::Add (this=0x1ef22d0, key=...) at ../../src/yb/rocksdb/table/fixed_size_filter_block.cc:91
#5  0x00007f1a9ed5b2ea in rocksdb::BlockBasedTableBuilder::Add (this=0x1e4dc00, key=..., value=...) at ../../src/yb/rocksdb/table/block_based_table_builder.cc:468
#6  0x00007f1a9eb80bd4 in rocksdb::BuildTable (dbname="/tmp/yb_tests__2020-12-14T18_15_29__23449.18214.17918/mytestdb-814110369", env=0x7f1a9f35fe40 <rocksdb::Env::Default()::default_env>, ioptions=..., env_options=...,
    table_cache=0x1e4b740, iter=0x7f1a8e961858, meta=0x7f1a8e962480, internal_comparator=std::shared_ptr<const rocksdb::InternalKeyComparator> (use count 3, weak count 0) = {...},
    int_tbl_prop_collector_factories=std::vector of length 1, capacity 1 = {...}, column_family_id=0, snapshots=std::vector of length 0, capacity 0, earliest_write_conflict_snapshot=72057594037927935,
    compression=rocksdb::kSnappyCompression, compression_opts=..., paranoid_file_checks=false, internal_stats=0x1ebc200, boundary_values_extractor=0x1e4c3f0, io_priority=rocksdb::Env::IO_HIGH, table_properties=0x7f1a8e962f70)
    at ../../src/yb/rocksdb/db/builder.cc:160
#7  0x00007f1a9ec8e56b in rocksdb::FlushJob::WriteLevel0Table (this=0x7f1a8e962eb0, mems=..., edit=0x1ec0268, meta=0x7f1a8e962480) at ../../src/yb/rocksdb/db/flush_job.cc:290
#8  0x00007f1a9ec8d767 in rocksdb::FlushJob::Run (this=0x7f1a8e962eb0, file_meta=0x7f1a8e962c70) at ../../src/yb/rocksdb/db/flush_job.cc:191
#9  0x00007f1a9ec10c56 in rocksdb::DBImpl::FlushMemTableToOutputFile (this=0x1ea0000, cfd=0x1bf7000, mutable_cf_options=..., made_progress=0x7f1a8e9640b7, job_context=0x7f1a8e963ee0, log_buffer=0x7f1a8e9635f0)
    at ../../src/yb/rocksdb/db/db_impl.cc:1873
#10 0x00007f1a9ec18bb6 in rocksdb::DBImpl::BackgroundFlush (this=0x1ea0000, made_progress=0x7f1a8e9640b7, job_context=0x7f1a8e963ee0, log_buffer=0x7f1a8e9635f0, cfd=0x1bf7000) at ../../src/yb/rocksdb/db/db_impl.cc:3202
#11 0x00007f1a9ec1914d in rocksdb::DBImpl::BackgroundCallFlush (this=0x1ea0000, cfd=0x0) at ../../src/yb/rocksdb/db/db_impl.cc:3276
#12 0x00007f1a9ec182fa in rocksdb::DBImpl::BGWorkFlush (db=0x1ea0000) at ../../src/yb/rocksdb/db/db_impl.cc:3132
#13 0x00007f1a9ee02747 in rocksdb::ThreadPool::BGThread (this=0x1c5ab60, thread_id=0) at ../../src/yb/rocksdb/util/thread_posix.cc:126
#14 0x00007f1a9ee028c6 in rocksdb::ThreadPool::<lambda()>::operator()(void) const (__closure=0x1e39c78) at ../../src/yb/rocksdb/util/thread_posix.cc:165
#15 0x00007f1a9ee03140 in std::_Function_handler<void(), rocksdb::ThreadPool::StartBGThreads()::<lambda()> >::_M_invoke(const std::_Any_data &) (__functor=...)
    at /opt/yb-build/brew/linuxbrew-20181203T161736v9-3ba4c2ed9b0587040949a4a9a95b576f520bae/Cellar/gcc/5.5.0_4/include/c++/5.5.0/functional:1871
#16 0x00007f1aa1efe732 in std::function<void ()>::operator()() const (this=0x1e39c78) at /opt/yb-build/brew/linuxbrew-20181203T161736v9-3ba4c2ed9b0587040949a4a9a95b576f520bae/Cellar/gcc/5.5.0_4/include/c++/5.5.0/functional:2267
#17 0x00007f1a95e6bcf9 in yb::Thread::SuperviseThread (arg=0x1e39c20) at ../../src/yb/util/thread.cc:771
#18 0x00007f1a91093694 in start_thread (arg=0x7f1a8e96c700) at pthread_create.c:333
#19 0x00007f1a90dd541d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
```

Test Plan:
```
#!/usr/bin/env bash

set -euo pipefail

for i in {1..50}
do
  echo "Iteration: $i"
  rm -rf build/debug-gcc-dynamic-ninja/share/initial_sys_catalog_snapshot
  ybd --sj packaged
  ./bin/yb-ctl destroy
  ./bin/yb-ctl start
  ./bin/ysqlsh -c "SELECT 1"
done
./bin/yb-ctl destroy
```

Reviewers: bogdan, sergei, dmitry, mbautin

Reviewed By: mbautin

Subscribers: eng

Differential Revision: https://phabricator.dev.yugabyte.com/D10121

CMakeLists.txt

@@ -414,11 +414,8 @@ ADD_CXX_FLAGS(-DYB_HEADERS_NO_STUBS=1)
 # For all builds:
 # For CMAKE_BUILD_TYPE=Debug
 #   -ggdb: Enable gdb debugging
-#   -O1: Enable minimum optimization
-#   -fno-omit-frame-pointer
-#       use frame pointers to allow simple stack frame walking for backtraces.
 # For CMAKE_BUILD_TYPE=FastDebug
-#   Same as DEBUG (TODO: remove fastdebug build type, use debug instead)
+#   Same as DEBUG, except with some optimizations on.
 # For CMAKE_BUILD_TYPE=Release
 #   -O3: Enable all compiler optimizations
 #   -g: Enable symbols for profiler tools (TODO: remove for shipping)
@@ -432,8 +429,8 @@ ADD_CXX_FLAGS(-DYB_HEADERS_NO_STUBS=1)
 #   2. Run the benchmarks (generates *.gcda profiling data).
 #   3. Build again with CMAKE_BUILD_TYPE_PROFILE_BUILD
 #     -fprofile-use: Compiler will use the profile outputs for optimizations
-set(CXX_FLAGS_DEBUG "-ggdb -O1 -fno-omit-frame-pointer")
-set(CXX_FLAGS_FASTDEBUG ${CXX_FLAGS_DEBUG})
+set(CXX_FLAGS_DEBUG "-ggdb")
+set(CXX_FLAGS_FASTDEBUG "-ggdb -O1 -fno-omit-frame-pointer")
 set(CXX_FLAGS_RELEASE "-O3 -g -DNDEBUG -fno-omit-frame-pointer")
 
 # Nullify CMake's predefined flags since we are handling different build types on our own.

src/yb/integration-tests/external_mini_cluster.cc

@@ -1172,7 +1172,7 @@ Status ExternalMiniCluster::StartMasters() {
 
 Status ExternalMiniCluster::WaitForInitDb() {
   const auto start_time = std::chrono::steady_clock::now();
-  const auto kTimeout = NonTsanVsTsan(900s, 1800s);
+  const auto kTimeout = NonTsanVsTsan(1200s, 1800s);
   int num_timeouts = 0;
   const int kMaxTimeouts = 10;
   while (true) {