extern alias_set_type get_frame_alias_set (void);
extern bool component_uses_parent_alias_set (const_tree);
extern bool alias_set_subset_of (alias_set_type, alias_set_type);
+extern int nonoverlapping_memrefs_p (const_rtx, const_rtx);
/* This alias set can be used to force a memory to conflict with all
other memories, creating a barrier across which no memory reference