[clang] Disallow btf_type_tag in C++ mode (PR #107238)

[Aaron Ballman via cfe-commits]

================
@@ -6490,6 +6490,15 @@ static void HandleBTFTypeTagAttribute(QualType &Type, 
const ParsedAttr &Attr,
                                       TypeProcessingState &State) {
   Sema &S = State.getSema();
 
+  // This attribute is only supported in C.
+  // FIXME: we should implement checkCommonAttributeFeatures() in SemaAttr.cpp
----------------
AaronBallman wrote:

https://github.com/llvm/llvm-project/issues/107249 for the bounds-safety 
related attributes
https://github.com/llvm/llvm-project/issues/107252 for the `lifetimebound` 
attribute

https://github.com/llvm/llvm-project/pull/107238
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