[clang] [Clang] Introduce OverflowBehaviorType for fine-grained overflow control (PR #148914)

[Justin Stitt via cfe-commits]

================
@@ -405,6 +405,9 @@ ArgType::matchesType(ASTContext &C, QualType argTy) const {
     argTy = PT->getPointeeType();
   }
 
+  if (const auto *OBT = argTy->getAs<OverflowBehaviorType>())
+    argTy = OBT->getUnderlyingType();
----------------
JustinStitt wrote:

Done in 
[4f3062d](https://github.com/llvm/llvm-project/pull/148914/commits/4f3062dca4f7627b04bceb456b5ad4d0a8d68eee),
 thanks.

https://github.com/llvm/llvm-project/pull/148914
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