[Bug rtl-optimization/78812] [5/6/7 Regression] Wrong code generation due to hoisting memory load across function call

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78812

--- Comment #13 from Jeffrey A. Law <law at redhat dot com> ---
So I  see a case in postreload-gcse.c where we might mis-handle when the
destination is a ZERO_EXTRACT or STRICT_LOW_PART.  Neither happen often which
is probably why we've never noticed.