PR tree-optimization/37161
	* tree-vectorizer.h (vect_get_smallest_scalar_type): Declare.
	* tree-vect-analyze.c (vect_get_smallest_scalar_type): New function.
	(vect_determine_vectorization_factor): Move the scalar type
	retrieval to vect_get_smallest_scalar_type.
	(vect_build_slp_tree): Call vect_get_smallest_scalar_type to get
	scalar type. Remove redundant computation.
	* tree-vect-transform.c (vect_get_constant_vectors): Add argument.
	(vect_get_slp_defs): Take the type of RHS into account if
	necessary by calling vect_get_smallest_scalar_type. Call
	vect_get_constant_vectors with additional argument.

From-SVN: r139518