[Bug tree-optimization/123672] [15/16 Regression] __builtin_shufflevector() produces incorrect code with -ftree-forwprop

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123672

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 63613
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63613&action=edit
gcc16-pr123672.patch

Untested fix.