[clang] [UBSAN] Preserve ubsan code with ubsan-unique-traps (PR #83470)

[Oskar Wirga via cfe-commits]

https://github.com/oskarwirga requested changes to this pull request.

If you are going to remove this feature, I would rather you simply revert the old commit. There is no point leaving the flag in at this point. 

I had explored earlier dealing with the optimization at a later time in the compilation pipeline, but got nowhere and this solution was ideal for my use case, binary size constraints limited any inlining so I never ran into the issue. I appreciate you cleaning this up! :)

https://github.com/llvm/llvm-project/pull/83470