[llvm-branch-commits] [clang][ubsan] Switch UBSAN optimization to `llvm.experimental.hot` (PR #84858)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/84858

Intrinsic introduced with #84850. Using intrinsic improves performance
by 3% comparing to removing traps (on
"test-suite/MultiSource/Benchmarks" with PGO+ThinLTO).

The pass will be renamed with #84852.