Remove more gimple_expr_type uses

Remove more gimple_expr_type uses

This removes a few more uses.

2021-07-16  Richard Biener   <rguenther@suse.de>

	* gimple-ssa-store-merging.c (verify_symbolic_number_p): Use
	the type of the LHS.
	(find_bswap_or_nop_1): Likewise.
	(find_bswap_or_nop): Likewise.
	* tree-vectorizer.h (vect_get_smallest_scalar_type): Adjust
	prototype.
	* tree-vect-data-refs.c (vect_get_smallest_scalar_type):
	Remove unused parameters, pass in the scalar type.  Fix
	internal store function handling.
	* tree-vect-stmts.c (vect_analyze_stmt): Remove assert.
	(vect_get_vector_types_for_stmt): Move down check for
	existing vector stmt after we've determined a scalar type.
	Pass down the used scalar type to vect_get_smallest_scalar_type.
	* tree-vect-generic.c (expand_vector_condition): Use
	the type of the LHS.
	(expand_vector_scalar_condition): Likewise.
	(expand_vector_operations_1): Likewise.
	* tree-vect-patterns.c (vect_widened_op_tree): Likewise.
	(vect_recog_dot_prod_pattern): Likewise.
	(vect_recog_sad_pattern): Likewise.
	(vect_recog_widen_op_pattern): Likewise.
	(vect_recog_widen_sum_pattern): Likewise.
	(vect_recog_mixed_size_cond_pattern): Likewise.