[Bug target/103269] Enable ZMM in MOVE_MAX and STORE_MAX_PIECES without -mprefer-vector-width=512

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103269

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 51803
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51803&action=edit
A patch

Please try this.