tree-vect-slp.c (vect_get_and_check_slp_defs): Try swapping operands to get a def operand kind match.

2014-10-20  Richard Biener  <rguenther@suse.de>

	* tree-vect-slp.c (vect_get_and_check_slp_defs): Try swapping
	operands to get a def operand kind match.  Signal mismatches
	to the parent so we can try swapping its operands.
	(vect_build_slp_tree): Try swapping operands if they have
	a mismatched operand kind.

From-SVN: r216463