re PR tree-optimization/50596 (Problems in vectorization of condition expression)

re PR tree-optimization/50596 (Problems in vectorization of condition expression)

	PR tree-optimization/50596
	* tree-vect-stmts.c (vect_mark_relevant): Only use
	FOR_EACH_IMM_USE_FAST if lhs is SSA_NAME.
	(vectorizable_store): If is_pattern_stmt_p look through
	VIEW_CONVERT_EXPR on lhs.
	* tree-vect-patterns.c (check_bool_pattern, adjust_bool_pattern):
	Use unsigned type instead of signed.
	(vect_recog_bool_pattern): Optimize also stores into bool memory in
	addition to casts from bool to integral types.
	(vect_mark_pattern_stmts): If pattern_stmt already has vinfo
	created, don't create it again.

	* gcc.dg/vect/vect-cond-10.c: New test.

From-SVN: r180424