[clang] [llvm] [X86] Support apxf in attribute target (PR #184078)

[Phoebe Wang via llvm-commits]

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@@ -179,10 +179,15 @@ bool X86TargetInfo::initFeatureMap(
       continue;
     }
 
+    if (llvm::X86::expandAPXFeatures(Feature, getTriple(), UpdatedFeaturesVec))
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phoebewang wrote:

That's fine. There's no universal solution for all the cases. Along with your example, we have known some APX features are good/bad to some cases, but we even don't allow specify them individually..

https://github.com/llvm/llvm-project/pull/184078