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

[Justin Stitt via cfe-commits]

================
@@ -1480,6 +1480,14 @@ class DeclRefExpr final
     return DeclRefExprBits.IsImmediateEscalating;
   }
 
+  bool isOverflowBehaviorDiscarded() const {
----------------
JustinStitt wrote:

Was able to avoid adding a bit to `ExprBits` in 
[5a4ac21](https://github.com/llvm/llvm-project/pull/148914/commits/5a4ac218ac4069a572b298e27e0fe9221fb8c953)

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