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

[segher at gcc dot gnu.org]

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

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
When -mno-powerpc64, I see.  Thanks.  Yeah this needs some untangling.