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

[Dan Liew via cfe-commits]

delcypher wrote:

@vitalybuka Thanks for approving. I think I addressed everyone's comments so I'm going to rebase, check everything still works, and then land.

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