tree-vect-loop.c (get_initial_def_for_induction): Use build_constructor directly.

tree-vect-loop.c (get_initial_def_for_induction): Use build_constructor directly.

2012-03-16  Richard Guenther  <rguenther@suse.de>

	* tree-vect-loop.c (get_initial_def_for_induction): Use
	build_constructor directly.
	* tree-vect-stmts.c (vect_get_vec_def_for_operand): Use
	build_vector_from_val.
	* tree.c (build_vector_from_val): Avoid creating a constructor
	first when we want a constant vector.

From-SVN: r185461