PR tree-optimization/57233

	PR tree-optimization/57233
	PR tree-optimization/61299
	* tree-vect-generic.c (get_compute_type, count_type_subparts): New
	functions.
	(expand_vector_operations_1): Use them.  If {L,R}ROTATE_EXPR
	would be lowered to scalar shifts, check if corresponding
	shifts and vector BIT_IOR_EXPR are supported and don't lower
	or lower just to narrower vector type in that case.
	* expmed.c (expand_shift_1): Fix up handling of vector
	shifts and rotates.

	* gcc.dg/pr57233.c: New test.
	* gcc.target/i386/pr57233.c: New test.
	* gcc.target/i386/sse2-pr57233.c: New test.
	* gcc.target/i386/avx-pr57233.c: New test.
	* gcc.target/i386/avx2-pr57233.c: New test.
	* gcc.target/i386/avx512f-pr57233.c: New test.
	* gcc.target/i386/xop-pr57233.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@212063 138bc75d-0d04-0410-961f-82ee72b054a4