[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 via Gcc-bugs]

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

--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
determine_block_size may return *min_size == *max_size.