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

[Justin Stitt via cfe-commits]

JustinStitt wrote:

@efriedma-quic thanks for your review. I've tried to address the concerns you brought up and marked the review points as resolved. If I didn't properly fix the issues then please un-resolve the messages. I'm happy to iterate :)

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