[Bug sanitizer/90865] ubsan causes coverage branch errors

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90865

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
> No, it's not desirable, but the current gcov can't distinguish between read
> code and the instrumented one.
> 

* real code