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

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

> > It happens later, in LLVM backend, it needs to be fixed.
> 
> From [#65972 (comment)](https://github.com/llvm/llvm-project/pull/65972#issuecomment-1971855638)
> 
> Is this something you have planned to fix? If not would replacing the .size() counter with perhaps a seeded random uint8 be acceptable?
> 
> My use case prevents me from shipping the minimal runtime alongside the instrumentation so my goal was to create an improvement (definitely imperfect!) to the debugability of a production deployment of BoundsSan. This PR as is would revert that behavior entirely.

I don't plan to do anything about it.
My point that it does not work even on trivial example as in description.
Unless you/someone else is willing to work on real fix, this behavior is not worse of preserving.

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