GCC crashed on AMD64 RHEL7 LTO + PGO 3.7:
https://buildbot.python.org/all/#/builders/190/builds/131

It crashed at the second stage of the PGO compilation (-fprofile-use).

---
(...)
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/asdl.o Python/asdl.c
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/ast.o Python/ast.c
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/ast_opt.o Python/ast_opt.c
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/ast_unparse.o Python/ast_unparse.c
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/bltinmodule.o Python/bltinmodule.c
In file included from ./Include/pytime.h:6:0,
                 from ./Include/Python.h:87,
                 from Python/bltinmodule.c:3:
Python/bltinmodule.c: In function ‘builtin_any’:
./Include/object.h:790:31: note: correcting inconsistent value profile: ic profiler overall count (78) does not match BB count (78)
     (*Py_TYPE(op)->tp_dealloc)((PyObject *)(op)))
                               ^
Python/bltinmodule.c:411:1: note: Inconsistent profile: indirect call target (0) does not exist
 builtin_any(PyObject *module, PyObject *iterable)
 ^
In file included from ./Include/pytime.h:6:0,
                 from ./Include/Python.h:87,
                 from Python/bltinmodule.c:3:
./Include/object.h:790:31: note: correcting inconsistent value profile: ic profiler overall count (0) does not match BB count (0)
     (*Py_TYPE(op)->tp_dealloc)((PyObject *)(op)))
                               ^
./Include/object.h:790:31: note: correcting inconsistent value profile: ic profiler overall count (0) does not match BB count (0)
Python/bltinmodule.c:2868:1: internal compiler error: Segmentation fault
 }
 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugzilla.redhat.com/bugzilla> for instructions.
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/ceval.o Python/ceval.c
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/compile.o Python/compile.c
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall    -flto -fuse-linker-plugin -ffat-lto-objects -flto-partition=none -g -std=c99 -Wextra -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fprofile-use -fprofile-correction  -I. -I./Include    -DPy_BUILD_CORE -o Python/codecs.o Python/codecs.c
Preprocessed source stored into /tmp/ccsdRI8K.out file, please attach this to your bugreport.
make[1]: *** [Python/bltinmodule.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory `/home/buildbot/buildarea/3.7.cstratak-RHEL7-x86_64.lto-pgo/build'
make: *** [profile-opt] Error 2
---

That's RHEL 7.7 with gcc-4.8.5-39.el7.x86_64.

The previous build was successful:
https://buildbot.python.org/all/#/builders/190/builds/130

CC.version: gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
datetime.datetime.now: 2020-03-24 16:20:36.900720

According to /var/log/yum.log, the latest package update was done at Mar 18 (05:13:07). So GCC wasn't update between build 130 and 131.