[Bug tree-optimization/45217] Tree optimizations do not recognize partial stores

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45217

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So I think isel should be able to recognize these. So I will be trying to
finish this up for GCC 15.