[Bug tree-optimization/121405] [13/14/15/16 Regression] Another missed VN via a copy (but via an int copy)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121405

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 62047
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62047&action=edit
Reduced using int rather than char

Combine in GCC 15+ is not able to do the combine in this case. Instead we get:
        salq    $32, %rsi
        shrq    $32, %rsi
        leal    (%rdi,%rsi), %eax
        ret

Which should be a the leal.