re PR tree-optimization/70916 (gcc ICE at -O3 on valid code on x86_64-linux-gnu in "tree_operand_check")

	PR tree-optimization/70916
	* tree-vect-patterns.c (vect_recog_mask_conversion_pattern): Give up
	if COND_EXPR rhs1 is neither SSA_NAME nor COMPARISON_CLASS_P.

	* gcc.c-torture/compile/pr70916.c: New test.

From-SVN: r235814