re PR tree-optimization/70354 (Wrong code with -O3 -march=broadwell and -march=skylak...

re PR tree-optimization/70354 (Wrong code with -O3 -march=broadwell and -march=skylake-avx512.)

	PR tree-optimization/70354
	* tree-vect-patterns.c (vect_recog_vector_vector_shift_pattern): If
	oprnd0 is wider than oprnd1 and there is a cast from the wider
	type to oprnd1, mask it with the mask of the narrower type.

	* gcc.dg/vect/pr70354-1.c: New test.
	* gcc.dg/vect/pr70354-2.c: New test.
	* gcc.target/i386/avx2-pr70354-1.c: New test.
	* gcc.target/i386/avx2-pr70354-2.c: New test.

From-SVN: r234417