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

[Phoebe Wang via cfe-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:

Support != meaningful. In the multiversioning scenario, the base features are the least ones. We always add more features to single functions rather than reduce. Anyway, I don't insist on it.

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