PR tree-opt/21591

        * tree-data-ref.c (ptr_decl_may_alias_p): Look for the name memory
        tag first.
        (ptr_ptr_may_alias_p): Likewise.
        (record_record_differ_p): New function.
        (base_object_differ_p): Call record_record_differ_p.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@117003 138bc75d-0d04-0410-961f-82ee72b054a4