[Bug other/111559] [14 regression] ICE when building Python with PGO

["sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111559

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
I don't think I'm going to be able to get a minimal reproducer for this, but
trying to at least get something a bit smaller/precise.

If I take inspiration from PR79587, I can do a bit better:
* wget https://www.python.org/ftp/python/3.11.5/Python-3.11.5.tar.xz
* tar xvf Python-3.11.5.tar.xz
* ./configure CC=gcc-14 --enable-optimizations
* make clean
* make profile-removal
* make build_all_generate_profile
* make profile-removal
* make run_profile_task # unfortunately this runs something like 44 different
Python tests
* make build_all_merge_profile
* gcc-14 -c -fno-strict-overflow -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1
-DNDEBUG     -O2 -pipe -march=native -fdiagnostics-color=always
-frecord-gcc-switches -Wreturn-type -ggdb3 -fwrapv -fno-semantic-interposition
-std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers
-Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden
-fprofile-use -fprofile-correction -I./Include/internal  -I. -I./Include
-I/usr/include/ncursesw  -fPIC -DPy_BUILD_CORE -o Parser/parser.o
Parser/parser.c -save-temps


```
gcc-14 -c -fno-strict-overflow -Wsign-compare -DDYNAMIC_ANNOTATIONS_ENABLED=1
-DNDEBUG     -O2 -pipe -fdiagnostics-color=always -frecord-gcc-switches
-Wreturn-type -ggdb3 -fwrapv -fno-semantic-interposition -std=c11 -Wextra
-Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes
-Werror=implicit-function-declaration -fvisibility=hidden -fprofile-use
-fprofile-correction -I./Include/internal  -I. -I./Include
-I/usr/include/ncursesw  -fPIC -DPy_BUILD_CORE -o Parser/parser.o
Parser/parser.c -save-temps
gcc-14: warning: ‘-pipe’ ignored because ‘-save-temps’ specified
Parser/parser.c: In function ‘_tmp_28_rule’:
Parser/parser.c:25179:1: error: probability of edge 3->4 not initialized
25179 | _tmp_28_rule(Parser *p)
      | ^~~~~~~~~~~~
Parser/parser.c:25179:1: error: probability of edge 5->11 not initialized
during GIMPLE pass: fixup_cfg
Parser/parser.c:25179:1: internal compiler error: verify_flow_info failed
0x55b70ce37153 verify_flow_info()
       
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/cfghooks.cc:287
0x55b70d295897 execute_function_todo
       
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/passes.cc:2100
0x55b70d295e10 execute_todo
       
/usr/src/debug/sys-devel/gcc-14.0.0_pre20230917/gcc-14-20230917/gcc/passes.cc:2142
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
```

```
$ gcc-14 -v
Using built-in specs.
COLLECT_GCC=gcc-14
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/14/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-14.0.0_pre20230917/work/gcc-14-20230917/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/14
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/14/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/14/python
--enable-languages=c,c++,fortran,rust --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo Hardened
14.0.0_pre20230917 p2' --with-gcc-major-version-only --enable-libstdcxx-time
--enable-lto --disable-libstdcxx-pch --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-multilib
--with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --enable-cet
--disable-systemtap --enable-valgrind-annotations --disable-vtable-verify
--disable-libvtv --with-zstd --with-isl --disable-isl-version-check
--enable-default-pie --enable-host-pie --enable-host-bind-now
--enable-default-ssp --with-build-config=bootstrap-cet
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20230917 (experimental) (Gentoo Hardened 14.0.0_pre20230917
p2)
```

I've uploaded build dir after running that last command at
https://dev.gentoo.org/~sam/bugs/gcc/gcc-python-pgo-x86/Python-3.11.5-pgo-crash.tar.xz.