* tree-vect-slp.c (vect_get_and_check_slp_defs): New parameter SWAP.
	Check slp defs for COND_EXPR by swapping/inverting operands if the
	new parameter SWAP indicates so.
	(vect_build_slp_tree_1): New parameter SWAP.  Check COND_EXPR stmt
	is isomorphic to the first stmt via swapping/inverting.  Store swap
	information in the new parameter SWAP.
	(vect_build_slp_tree): New local array SWAP and pass it to function
	vect_build_slp_tree_1.  Cleanup result handling code for function
	call to vect_get_and_check_slp_defs.  Skip operand swapping if the
	order of operands has been fixed as indicated by SWAP[i].

From-SVN: r241697