tree-vect-data-refs.c (vect_can_force_dr_alignment_p): Reorg to use symtab and decl_binds_to_current_def_p

	* tree-vect-data-refs.c (vect_can_force_dr_alignment_p): Reorg
	to use symtab and decl_binds_to_current_def_p
	* tree-vectorizer.c (increase_alignment): Increase alignment
	of alias target, too.

From-SVN: r211599