PR tree-optimization/61403
	* config/i386/i386.c (expand_vec_perm_palignr): Fix a spelling
	error in comment.  Also optimize 256-bit vectors for AVX2
	or AVX (floating vectors only), provided the first permutation
	can be performed in one insn.

	* gcc.dg/torture/vshuf-32.inc: Add a new test 29.

Co-Authored-By: Uros Bizjak <ubizjak@gmail.com>

From-SVN: r215866