alias.h (component_uses_parent_alias_set): Rename to ...

2013-09-26  Richard Biener  <rguenther@suse.de>

	* alias.h (component_uses_parent_alias_set): Rename to ...
	(component_uses_parent_alias_set_from): ... this.
	* alias.c (component_uses_parent_alias_set): Rename to ...
	(component_uses_parent_alias_set_from): ... this and return
	the desired parent.
	(reference_alias_ptr_type_1): Use the result from
	component_uses_parent_alias_set_from instead of stripping
	components one at a time.
	* emit-rtl.c (set_mem_attributes_minus_bitpos): Adjust.

From-SVN: r202948