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

[Oleksandr T. via cfe-commits]

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

@AaronBallman Thanks. Just to confirm, are future attribute names valid in 
previous versions? For instance, can `C++11` use the `deprecated` attribute 
from `C++14`?

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