[Bug target/72802] powerpc64le: -mcpu=power9 emits lxssp instruction with offset that isn't a multiple of 4

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72802

--- Comment #3 from Alan Modra <amodra at gmail dot com> ---
wY is using mem_operand_gpr which is designed for gpr loads/stores.  When -m32,
mem_operand_gpr does not enforce multiple-of-4 offsets.