[Bug middle-end/89252] Vector load/store aren't used to initialize large memory

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89252

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 45643
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45643&action=edit
A patch