[builtin][NFC] Remove ClangBuiltin<"__builtin_allow_ubsan_check"> (#87581)

We don't need clang builtin for this one.

It was copy pasted from `__builtin_allow_runtime_check`

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