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

[Justin Stitt via cfe-commits]

JustinStitt wrote:

> Yes.

Great see commit [`af63956`](https://github.com/llvm/llvm-project/pull/148914/commits/af6395691ad98c3763d89e4794f353e77f0e3d9b). I just stole the pattern from the array canonicalization code.

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