[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:

Thoughts on not passing anything through but rather computing whether we are in 
an assignment context using parent map? I can traverse up the parents to look 
for a Binary operator assignment.

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