[Bug target/85038] x32: unnecessary address-size prefix when a pointer register is already zero-extended

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85038

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note on some aarch64 micro-arch, the zero extend does not take up an issue slot
and is removed in the pipeline before issue.  So it might be less than an issue
about the zero extend there except for cache reasons.