[Bug tree-optimization/123656] [16 Regression] wrong code with unsigned char [2] vector multiplication by 210 since r16-5095

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123656

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 63381
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63381&action=edit
gcc16-pr123656.patch

Untested fix.