[llvm-branch-commits] [CodeGen] Add default lowering for llvm.allow.{runtime, ubsan}.check() (PR #86049)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/86049

RFC: https://discourse.llvm.org/t/rfc-add-llvm-experimental-hot-intrinsic-or-llvm-hot/77641