* alias.c (component_uses_parent_alias_set): Rename from
        can_address_p.  Return bool.  Reverse the sense of the result.
        Reinstate the check for alias set zero.
        (get_alias_set): Update to match.
        * alias.h (component_uses_parent_alias_set): Likewise.
        * emit-rtl.c (set_mem_attributes_minus_bitpos): Likewise.
        * expr.c (expand_assignment): Likewise.
        * expr.h: Remove commented out prototypes that were moved to alias.h.

From-SVN: r91712