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

[Phoebe Wang via cfe-commits]

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

I think we don't need to care negative feature in attribute?

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