[llvm] Enable logf128 constant folding for hosts with 128bit long double (PR #96287)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-x86_64-linux` running on `sanitizer-buildbot2` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/66/builds/2673

Here is the relevant piece of the build log for the reference:
```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
[374/378] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64-with-call.o
[375/378] Generating Msan-x86_64-with-call-Test
[376/378] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64.o
[377/378] Generating Msan-x86_64-Test
[377/378] Running compiler_rt regression tests
llvm-lit: /home/b/sanitizer-x86_64-linux/build/llvm-project/llvm/utils/lit/lit/discovery.py:276: warning: input '/home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/rtsan/X86_64LinuxConfig' contained no tests
llvm-lit: /home/b/sanitizer-x86_64-linux/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 10106 tests, 88 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
TIMEOUT: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c (10106 of 10106)
******************** TEST 'SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c' FAILED ********************
Exit Code: 137
Timeout: Reached timeout of 900 seconds

Command Output (stderr):
--
RUN: at line 1: /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang  -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing  -m64 -funwind-tables  -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp && env HWASAN_OPTIONS=die_after_fork=0  /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing -m64 -funwind-tables -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ env HWASAN_OPTIONS=die_after_fork=0 /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
==899652==ERROR: HWAddressSanitizer: allocation-tail-overwritten; heap object [0x480600001860,0x480600001888) of size 40
==898802==ERROR: HWAddressSanitizer: allocation-tail-overwritten; heap object [0x480600001860,0x480600001888) of size 40


Stack of invalid access unknown. Issue detected at deallocation time.
Stack of invalid access unknown. Issue detected at deallocation time.
deallocated here:
deallocated here:
/home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.script: line 1: 898802 Killed                  env HWASAN_OPTIONS=die_after_fork=0 /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 

1 warning(s) in tests
Slowest Tests:
--------------------------------------------------------------------------
900.05s: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c
218.70s: libFuzzer-x86_64-default-Linux :: out-of-process-fuzz.test
213.25s: libFuzzer-x86_64-libcxx-Linux :: out-of-process-fuzz.test
207.26s: libFuzzer-x86_64-static-libcxx-Linux :: out-of-process-fuzz.test
42.16s: libFuzzer-i386-default-Linux :: fork_corpus_groups.test
41.42s: libFuzzer-i386-libcxx-Linux :: fork_corpus_groups.test
39.60s: libFuzzer-i386-static-libcxx-Linux :: fork.test
39.35s: libFuzzer-x86_64-libcxx-Linux :: fork_corpus_groups.test
39.35s: libFuzzer-i386-default-Linux :: fork.test
39.11s: libFuzzer-x86_64-libcxx-Linux :: fork.test
39.05s: libFuzzer-i386-libcxx-Linux :: fork.test
38.79s: libFuzzer-i386-static-libcxx-Linux :: fork_corpus_groups.test
Step 9 (test compiler-rt symbolizer) failure: test compiler-rt symbolizer (failure)
...
[374/378] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64-with-call.o
[375/378] Generating Msan-x86_64-with-call-Test
[376/378] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64.o
[377/378] Generating Msan-x86_64-Test
[377/378] Running compiler_rt regression tests
llvm-lit: /home/b/sanitizer-x86_64-linux/build/llvm-project/llvm/utils/lit/lit/discovery.py:276: warning: input '/home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/rtsan/X86_64LinuxConfig' contained no tests
llvm-lit: /home/b/sanitizer-x86_64-linux/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 10106 tests, 88 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
TIMEOUT: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c (10106 of 10106)
******************** TEST 'SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c' FAILED ********************
Exit Code: 137
Timeout: Reached timeout of 900 seconds

Command Output (stderr):
--
RUN: at line 1: /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang  -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing  -m64 -funwind-tables  -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp && env HWASAN_OPTIONS=die_after_fork=0  /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing -m64 -funwind-tables -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ env HWASAN_OPTIONS=die_after_fork=0 /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
==899652==ERROR: HWAddressSanitizer: allocation-tail-overwritten; heap object [0x480600001860,0x480600001888) of size 40
==898802==ERROR: HWAddressSanitizer: allocation-tail-overwritten; heap object [0x480600001860,0x480600001888) of size 40


Stack of invalid access unknown. Issue detected at deallocation time.
Stack of invalid access unknown. Issue detected at deallocation time.
deallocated here:
deallocated here:
/home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.script: line 1: 898802 Killed                  env HWASAN_OPTIONS=die_after_fork=0 /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..

1 warning(s) in tests
Slowest Tests:
--------------------------------------------------------------------------
900.05s: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c
218.70s: libFuzzer-x86_64-default-Linux :: out-of-process-fuzz.test
213.25s: libFuzzer-x86_64-libcxx-Linux :: out-of-process-fuzz.test
207.26s: libFuzzer-x86_64-static-libcxx-Linux :: out-of-process-fuzz.test
42.16s: libFuzzer-i386-default-Linux :: fork_corpus_groups.test
41.42s: libFuzzer-i386-libcxx-Linux :: fork_corpus_groups.test
39.60s: libFuzzer-i386-static-libcxx-Linux :: fork.test
39.35s: libFuzzer-x86_64-libcxx-Linux :: fork_corpus_groups.test
39.35s: libFuzzer-i386-default-Linux :: fork.test
39.11s: libFuzzer-x86_64-libcxx-Linux :: fork.test
39.05s: libFuzzer-i386-libcxx-Linux :: fork.test
38.79s: libFuzzer-i386-static-libcxx-Linux :: fork_corpus_groups.test

```

https://github.com/llvm/llvm-project/pull/96287