Replace current_vector_size with vec_info::vector_size

Replace current_vector_size with vec_info::vector_size

2019-10-21  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-vectorizer.h (vec_info::vector_size): New member variable.
	(vect_update_max_nunits): Update comment.
	(current_vector_size): Delete.
	* tree-vect-stmts.c (current_vector_size): Likewise.
	(get_vectype_for_scalar_type): Use vec_info::vector_size instead
	of current_vector_size.
	(get_mask_type_for_scalar_type): Likewise.
	* tree-vectorizer.c (try_vectorize_loop_1): Likewise.
	* tree-vect-loop.c (vect_update_vf_for_slp): Likewise.
	(vect_analyze_loop, vect_halve_mask_nunits): Likewise.
	(vect_double_mask_nunits, vect_transform_loop): Likewise.
	* tree-vect-slp.c (can_duplicate_and_interleave_p): Likewise.
	(vect_make_slp_decision, vect_slp_bb_region): Likewise.

From-SVN: r277235