[clang] [clang] [sanitizer] predict trap checks succeed (PR #134310)

[Thurston Dang via cfe-commits]

thurstond wrote:

> Trap checks fail at most once (when the program crashes).

It's technically possible to have a signal handler that consumes SIGILL and then jumps over the offending instruction. The UBSan docs allude to this: "-fsanitize-trap=...: execute a trap instruction (doesn’t require UBSan run-time support). If the signal is not caught, the program will typically terminate due to a SIGILL or SIGTRAP signal." (https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html)

That said, I agree that it is extremely likely the trap only happens once.

https://github.com/llvm/llvm-project/pull/134310