[Bug target/105033] Suboptimal for vec_concat lower halves of two vectors.

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105033

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
Created attachment 52776
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52776&action=edit
Patch pending for GCC13