[clang] [Clang] restrict use of attribute names reserved by the C++ standard (PR #106036)

[Aaron Ballman via cfe-commits]

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@@ -177,6 +177,26 @@ static bool isLanguageDefinedBuiltin(const SourceManager &SourceMgr,
   return false;
 }
 
+static bool isReservedAttrName(Preprocessor &PP, IdentifierInfo *II) {
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AaronBallman wrote:

They don't support it: https://godbolt.org/z/9dxshKxj9

> Especially if that rule has been standardized by C.

Yeah, I should probably write a paper for WG21 proposing this.

https://github.com/llvm/llvm-project/pull/106036