[clang] [clang] Add optional pass to remove UBSAN traps using PGO (PR #84214)

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

> yes, but I'd like to that after we collect feedback from first users

They are introduced by earlier transformations

Note: I'd like to have special intrinsic for this optimization. When we have it, we likely don't need this SimplifyCFG.

https://github.com/llvm/llvm-project/pull/84214