[Bug middle-end/80100] simplify-rtx.c sanitizer detects undefined behaviour with optimization

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80100

--- Comment #2 from Vittorio Zecca <zeccav at gmail dot com> ---
simplify-rtx.c:2743 is "HOST_WIDE_INT mask = INTVAL (trueop1) << count;"