[Bug rtl-optimization/83565] RTL combine pass breaks shift result (at least on ia64)

[jrtc27 at jrtc27 dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83565

--- Comment #4 from James Clarke <jrtc27 at jrtc27 dot com> ---
Created attachment 42961
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42961&action=edit
Zero-out high 32 bits after a rotate

Please try the attached patch.