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

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> I sent some fixes to resolve an issue I was encountering when building a downstream Linux kernel tree. Other than that, is there anything else folks would like to see done for this PR? Since we're on an experimental tag now, I think the goal should be to get something relatively stable out there so people can try it out.

I still need to do another round of review, but I wanted to mention that WG14 reflectors had a discussion going in early December (starting from reflector message 34496 which is unfortunately not publicly available) about splitting integer operations by behavior. I hopped into the thread and brought up this RFC and PR so the committee members following the discussion can be aware of what's happening in our implementation.

Hopefully I can get to the review this week, but I think it's better for this functionality to land after we've already made the branch for Clang 22 (IIRC that's happening next week on the 13th, so it's not a long wait).

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