Makefile: Remove -polly-detect-keep-going cmdline option

A recent clang 16 update has introduced segfault when compiling kernel
using the `-polly-invariant-load-hoisting` flag and breaks compilation
when kernel is compiled with full LTO.
This is due to the flag being ignorant about the errors during SCoP
verification and does not take the errors into account as per a recent
issue opened at [LLVM], causing polly to do segfault and the compiler
to print the following backtrace:

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: clang -Wp,-MD,drivers/md/.md.o.d -nostdinc -isystem /tmp/cirrus-ci-build/toolchains/clang/lib/clang/16.0.0/include -I../arch/arm64/include -I./arch/arm64/include/generated -I../include -I./include -I../arch/arm64/include/uapi -I./arch/arm64/include/generated/uapi -I../include/uapi -I./include/generated/uapi -include ../include/linux/kconfig.h -include ../include/linux/compiler_types.h -I../drivers/md -Idrivers/md -D__KERNEL__ -mlittle-endian -DKASAN_SHADOW_SCALE_SHIFT=3 -Qunused-arguments -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -Werror-implicit-function-declaration -Werror=return-type -Wno-format-security -std=gnu89 --target=aarch64-linux-gnu --prefix=/tmp/cirrus-ci-build/Kernel/../toolchains/clang/bin/aarch64-linux-gnu- --gcc-toolchain=/tmp/cirrus-ci-build/toolchains/clang -Wno-misleading-indentation -Wno-bool-operation -Werror=unknown-warning-option -Wno-unsequenced -opaque-pointers -fno-PIE -mgeneral-regs-only -DCONFIG_AS_LSE=1 -fno-asynchronous-unwind-tables -Wno-psabi -DKASAN_SHADOW_SCALE_SHIFT=3 -fno-delete-null-pointer-checks -Wno-frame-address -Wno-int-in-bool-context -Wno-address-of-packed-member -O3 -march=armv8.1-a+crypto+fp16+rcpc -mtune=cortex-a53 -mllvm -polly -mllvm -polly-ast-use-context -mllvm -polly-detect-keep-going -mllvm -polly-invariant-load-hoisting -mllvm -polly-run-inliner -mllvm -polly-vectorizer=stripmine -mllvm -polly-loopfusion-greedy=1 -mllvm -polly-reschedule=1 -mllvm -polly-postopts=1 -fstack-protector-strong --target=aarch64-linux-gnu --gcc-toolchain=/tmp/cirrus-ci-build/toolchains/clang -meabi gnu -Wno-format-invalid-specifier -Wno-gnu -Wno-duplicate-decl-specifier -Wno-asm-operand-widths -Wno-initializer-overrides -Wno-tautological-constant-out-of-range-compare -Wno-tautological-compare -mno-global-merge -Wno-void-ptr-dereference -Wno-unused-but-set-variable -Wno-unused-const-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wvla -flto -fwhole-program-vtables -fvisibility=hidden -Wdeclaration-after-statement -Wno-pointer-sign -Wno-array-bounds -fno-strict-overflow -fno-stack-check -Werror=implicit-int -Werror=strict-prototypes -Werror=date-time -Werror=incompatible-pointer-types -fmacro-prefix-map=../= -Wno-initializer-overrides -Wno-unused-value -Wno-format -Wno-sign-compare -Wno-format-zero-length -Wno-uninitialized -Wno-pointer-to-enum-cast -Wno-unaligned-access -DKBUILD_BASENAME=\"md\" -DKBUILD_MODNAME=\"md_mod\" -D__KBUILD_MODNAME=kmod_md_mod -c -o drivers/md/md.o ../drivers/md/md.c
1.	<eof> parser at end of file
2.	Optimizer
  CC      drivers/media/platform/msm/camera_v2/camera/camera.o
  AR      drivers/media/pci/intel/ipu3/built-in.a
  CC      drivers/md/dm-linear.o
 #0 0x0000559d3527073f (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x3a7073f)
 #1 0x0000559d352705bf (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x3a705bf)
 #2 0x0000559d3523b198 (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x3a3b198)
 #3 0x0000559d3523b33e (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x3a3b33e)
 #4 0x00007f339dc3ea00 (/usr/lib/libc.so.6+0x38a00)
 #5 0x0000559d35affccf (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x42ffccf)
 #6 0x0000559d35b01710 (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x4301710)
 #7 0x0000559d35b01a12 (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x4301a12)
 #8 0x0000559d35b09a9e (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x4309a9e)
 #9 0x0000559d35b14707 (/tmp/cirrus-ci-build/toolchains/clang/bin/clang-16+0x4314707)
clang-16: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Neutron clang version 16.0.0 (https://github.com/llvm/llvm-project.git 598f5275c16049b1e1b5bc934cbde447a82d485e)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /tmp/cirrus-ci-build/Kernel/../toolchains/clang/bin

From the very nature of `-polly-detect-keep-going`, it can be concluded
that this is a potentially unsafe flag and instead of using it conditionally
for CLANG < 16, just remove it all together for all. This should allow polly
to run SCoP verifications as intended.

Issue [LLVM]: llvm/llvm-project#58484 (comment)

Change-Id: 9a2d8205cf5e0259d6b261e2d7753f3d939759bf
Signed-off-by: Tashfin Shakeer Rhythm <tashfinshakeerrhythm@gmail.com>
Signed-off-by: TogoFire <togofire@mailfence.com>

Makefile

@@ -752,7 +752,6 @@ KBUILD_CFLAGS	+= -mllvm -polly \
 		   -mllvm -polly-loopfusion-greedy=1 \
 		   -mllvm -polly-postopts=1 \
 		   -mllvm -polly-ast-use-context \
-		   -mllvm -polly-detect-keep-going \
 		   -mllvm -polly-vectorizer=stripmine \
 		   -mllvm -polly-invariant-load-hoisting
 endif