[clang] [llvm] [Clang][LoongArch] Support target attribute for function (PR #140700)

[via cfe-commits]

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@@ -388,6 +388,76 @@ bool LoongArchTargetInfo::handleTargetFeatures(
   return true;
 }
 
+enum class AttrFeatureKind { Arch, Tune, NoFeature, Feature, Invalid };
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wangleiat wrote:

Is Invalid unused?

https://github.com/llvm/llvm-project/pull/140700