[Bug rtl-optimization/92656] The zero_extend insn can't be eliminated in the combine pass

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92656

--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The is no simple solution, yeah.  It may be possible to have a simple change
that results in better code on average, but that will be marginal :-/