PR middle-end/51590
	PR tree-optimization/51606
	* tree-vect-patterns.c (append_pattern_def_seq, new_pattern_def_seq):
	New inline functions.
	(vect_recog_over_widening_pattern,
	vect_recog_vector_vector_shift_pattern,
	vect_recog_sdivmod_pow2_pattern, vect_recog_mixed_size_cond_pattern,
	adjust_bool_pattern_cast, vect_recog_bool_pattern): Use them.

	* gcc.dg/vect/pr51590.c: New test.

From-SVN: r182480