[llvm] [CodeGen] Remove `-enable-unsafe-fp-math` option (PR #164559)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clangd-ubuntu-tsan` running on `clangd-ubuntu-clang` while building `llvm` at step 6 "test-build-clangd-clangd-index-server-clangd-in...".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/134/builds/28504

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-clangd-clangd-index-server-clangd-in...) failure: test (failure)
******************** TEST 'Clangd :: remote-index/public-log.test' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
rm -rf /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/remote-index/Output/public-log.test.tmp # RUN: at line 1
+ rm -rf /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/remote-index/Output/public-log.test.tmp
clangd-indexer /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/Inputs/Source.cpp > /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/remote-index/Output/public-log.test.tmp.idx # RUN: at line 2
+ clangd-indexer /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/Inputs/Source.cpp
Error while trying to load a compilation database:
Could not auto-detect compilation database for file "/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/Inputs/Source.cpp"
No compilation database found in /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/Inputs or any parent directory
fixed-compilation-database: Error while opening fixed database: No such file or directory
json-compilation-database: Error while opening JSON database: No such file or directory
Running without flags.
"/usr/bin/python3.8" /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/pipeline_helper.py --input-file-name=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/public-log.test --server-arg=--log=verbose --server-arg=-log-public --server-log=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/remote-index/Output/public-log.test.tmp.public.log --project-root=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index --index-file=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/remote-index/Output/public-log.test.tmp.idx > /dev/null # RUN: at line 3
+ /usr/bin/python3.8 /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/pipeline_helper.py --input-file-name=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index/public-log.test --server-arg=--log=verbose --server-arg=-log-public --server-log=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/remote-index/Output/public-log.test.tmp.public.log --project-root=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/remote-index --index-file=/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/remote-index/Output/public-log.test.tmp.idx
Initializing clangd-index-server...
Server initialization failed. Shutting down.

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/164559