[Bug tree-optimization/92689] New: Improve stmt_may_clobber_ref_p_1 on constant memory reference

[fxue at os dot amperecomputing.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92689

            Bug ID: 92689
           Summary: Improve stmt_may_clobber_ref_p_1 on constant memory
                    reference
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fxue at os dot amperecomputing.com
  Target Milestone: ---

If ao_ref represents a constant data, stmt_may_clobber_ref_p_1() and
call_may_clobber_ref_p() can return false. But not sure there is any subtlety
behind it, which I missed.