[llvm] [WIP][X86] Replace custom ADD reduction pattern matching with ISD::VECREDUCE_ADD support (PR #205098)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 62317 tests passed
* 1857 tests skipped

All executed tests passed, but another part of the build **failed**. Click on a failure below to see the details.

<details>
<summary>[code=4294967295] unittests/tools/llvm-cfi-verify/CFIVerifyTests.exe</summary>

```
FAILED: [code=4294967295] unittests/tools/llvm-cfi-verify/CFIVerifyTests.exe
C:\Windows\system32\cmd.exe /C "cd . && C:\BuildTools\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe -E vs_link_exe --msvc-ver=1944 --intdir=unittests\tools\llvm-cfi-verify\CMakeFiles\CFIVerifyTests.dir --rc="C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x64\rc.exe" --mt="C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x64\mt.exe" --manifests  -- C:\clang\clang-msvc\bin\lld-link.exe /nologo @CMakeFiles\CFIVerifyTests.rsp  /out:unittests\tools\llvm-cfi-verify\CFIVerifyTests.exe /implib:unittests\tools\llvm-cfi-verify\CFIVerifyTests.lib /pdb:unittests\tools\llvm-cfi-verify\CFIVerifyTests.pdb /version:0.0 /MANIFEST:NO /Brepro /INCREMENTAL:NO /subsystem:console  /STACK:10000000 && cd ."
LINK: command "C:\clang\clang-msvc\bin\lld-link.exe /nologo @CMakeFiles\CFIVerifyTests.rsp /out:unittests\tools\llvm-cfi-verify\CFIVerifyTests.exe /implib:unittests\tools\llvm-cfi-verify\CFIVerifyTests.lib /pdb:unittests\tools\llvm-cfi-verify\CFIVerifyTests.pdb /version:0.0 /MANIFEST:NO /Brepro /INCREMENTAL:NO /subsystem:console /STACK:10000000" failed (exit code 1) with the following output:
lld-link: error: undefined symbol: LLVMInitializeBPFDisassembler

>>> referenced by unittests\tools\llvm-cfi-verify\CMakeFiles\CFIVerifyTests.dir\FileAnalysis.cpp.obj:(void __cdecl llvm::InitializeAllDisassemblers(void))

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/205098