build: disable libstdc++ debug containers globally

Different parts of the debug build were using differently sized
std::vectors due to `_GLIBCXX_DEBUG` sometimes being defined and
sometimes not. That ended about as well as you would expect.

Remove the flag.

Fixes: #30056

PR-URL: #30147
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

common.gypi

@@ -29,10 +29,6 @@
 
     'openssl_fips%': '',
 
-    # Some STL containers (e.g. std::vector) do not preserve ABI compatibility
-    # between debug and non-debug mode.
-    'disable_glibcxx_debug': 1,
-
     # Don't use ICU data file (icudtl.dat) from V8, we use our own.
     'icu_use_data_file_flag%': 0,
 

tools/v8_gypfiles/toolchain.gypi

@@ -64,9 +64,6 @@
     # Print to stdout on Android.
     'v8_android_log_stdout%': 0,
 
-    # Force disable libstdc++ debug mode.
-    'disable_glibcxx_debug%': 0,
-
     'v8_enable_backtrace%': 0,
 
     # Enable profiling support. Only required on Windows.
@@ -1167,11 +1164,6 @@
             # Support for backtrace_symbols.
             'ldflags': [ '-rdynamic' ],
           }],
-          ['OS=="linux" and disable_glibcxx_debug==0', {
-            # Enable libstdc++ debugging facilities to help catch problems
-            # early, see http://crbug.com/65151 .
-            'defines': ['_GLIBCXX_DEBUG=1',],
-          }],
           ['OS=="aix"', {
             'ldflags': [ '-Wl,-bbigtoc' ],
             'conditions': [