Use DR_IS_WRITE instead of !DR_IS_READ.

Use DR_IS_WRITE instead of !DR_IS_READ.

2010-09-03  Sebastian Pop  <sebastian.pop@amd.com>

	* tree-data-ref.c (dr_may_alias_p): Replace !DR_IS_READ with
	DR_IS_WRITE.
	(compute_all_dependences): Same.
	(create_rdg_edge_for_ddr): Same.
	* tree-data-ref.h (DR_IS_WRITE): New.
	(ddr_is_anti_dependent): Replace !DR_IS_READ with DR_IS_WRITE.
	* tree-if-conv.c (write_memrefs_written_at_least_once): Same.
	(write_memrefs_written_at_least_once): Same.
	* tree-predcom.c (suitable_component_p): Same.
	(determine_roots_comp): Same.
	(execute_load_motion): Same.
	* tree-vect-data-refs.c (vect_analyze_data_ref_dependence): Same.
	(vect_enhance_data_refs_alignment): Same.
	(vect_analyze_group_access): Same.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@163841 138bc75d-0d04-0410-961f-82ee72b054a4