[clang] [X86] Clear EVEX512 feature for 128-bit and 256-bit FMA intrinsics (PR #156472)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `cross-project-tests-sie-ubuntu-dwarf5` running on `doug-worker-1b` while building `clang` at step 6 "test-build-unified-tree-check-cross-project".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/163/builds/25779

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

```
Step 6 (test-build-unified-tree-check-cross-project) failure: test (failure)
******************** TEST 'cross-project-tests :: debuginfo-tests/dexter/feature_tests/subtools/test/label_offset.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
clang++ -O0 -glldb -std=gnu++11 /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/label_offset.cpp -o /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/projects/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/Output/label_offset.cpp.tmp # RUN: at line 4
+ clang++ -O0 -glldb -std=gnu++11 /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/label_offset.cpp -o /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/projects/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/Output/label_offset.cpp.tmp
"/usr/bin/python3.10" "/home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/dexter.py" test --fail-lt 1.0 -w --debugger lldb-dap --lldb-executable "/home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/bin/lldb-dap" --binary /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/projects/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/Output/label_offset.cpp.tmp -v -- /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/label_offset.cpp | /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/bin/FileCheck /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/label_offset.cpp # RUN: at line 5
+ /usr/bin/python3.10 /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/dexter.py test --fail-lt 1.0 -w --debugger lldb-dap --lldb-executable /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/bin/lldb-dap --binary /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/projects/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/Output/label_offset.cpp.tmp -v -- /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/label_offset.cpp
+ /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/bin/FileCheck /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/llvm-project/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/label_offset.cpp
note: Opening DAP server: /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu-dwarf5/build/bin/lldb-dap
warning: DAP: Unknown support flag: $__lldb_version
warning: DAP: Unknown support flag: completionTriggerCharacters
warning: DAP: Unknown support flag: exceptionBreakpointFilters
warning: DAP: Unknown support flag: supportTerminateDebuggee
warning: DAP: Unknown support flag: supportsBreakpointLocationsRequest
warning: DAP: Unknown support flag: supportsCompletionsRequest
warning: DAP: Unknown support flag: supportsDelayedStackTraceLoading
warning: DAP: Unknown support flag: supportsExceptionFilterOptions
warning: DAP: Unknown support flag: supportsExceptionInfoRequest
warning: DAP: Unknown support flag: supportsModuleSymbolsRequest
warning: DAP: Unknown support flag: capabilities
note: Successfully disconnected from DAP server.


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


```

</details>

https://github.com/llvm/llvm-project/pull/156472