[clang] [compiler-rt] [UBSan] Diagnose assumption violation (PR #104741)

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

I wonder how much code will be broken.
We have internally `fsanitize=builtin` enabled, as is patch will break and force us to disable the sanitizers.
I will try to run internal tests, and clang itself with a new check.

If it breaks to much, we will need to create a new sanitizers, e.g `-fsanitize=assume`.


https://github.com/llvm/llvm-project/pull/104741