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

[via cfe-commits]

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@@ -85,6 +85,7 @@ struct ArchInfo {
 };
 
 bool isValidArchName(StringRef Arch);
+bool isValidFeatureName(StringRef Arch);
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Ami-zhang wrote:

Done.

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