[Bug middle-end/125977] emit_block_move_via_pattern/set_storage_via_setmem don't check min_size == max_size

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125977

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 64846
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64846&action=edit
A patch

This patch works for me.