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

[slyfox at inbox dot ru]

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

--- Comment #6 from Sergei Trofimovich <slyfox at inbox dot ru> ---
(In reply to James Clarke from comment #4)
> Created attachment 42961 [details]
> Zero-out high 32 bits after a rotate
> 
> Please try the attached patch.

The patch works on an attached example. Building 7.2.0 with your patch to check
on openssl testsuite.

Thank you!