Simplify ix86_expand_vector_move_misalign

Simplify ix86_expand_vector_move_misalign

Since mov<mode>_internal patterns handle both aligned/unaligned load
and store, we can simplify ix86_avx256_split_vector_move_misalign and
ix86_expand_vector_move_misalign.

	* config/i386/i386.c (ix86_avx256_split_vector_move_misalign):
	Short-cut unaligned load and store cases.  Handle all integer
	vector modes.
	(ix86_expand_vector_move_misalign): Short-cut unaligned load
	and store cases.  Call ix86_avx256_split_vector_move_misalign
	directly without checking mode class.

From-SVN: r235283