[clang] [lldb] [UBSan][BoundsSafety] Implement support for more expressive "trap reasons" (PR #154618)

[Dan Liew via cfe-commits]

delcypher wrote:

@thurstond Thanks for the feedback. I've tried to address your comments and I also added a brief discussion of optimized-vs-unoptimized builds.

https://github.com/llvm/llvm-project/pull/154618