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

[via cfe-commits]

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@@ -3195,6 +3195,17 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
     }
   }
 
+  if (Context.getTargetInfo().getTriple().isLoongArch()) {
+    for (const auto &Feature : ParsedAttrs.Features) {
+      StringRef CurFeature = Feature;
+      if (CurFeature.starts_with("!arch=")) {
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wangleiat wrote:

According to `LoongArchTargetInfo::parseTargetAttr()`, this condition may always be false.

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