tree-ssa-loop-niter.c (tree_simplify_using_condition): Expand simple definitions of ssa names in condition.

	* tree-ssa-loop-niter.c (tree_simplify_using_condition): Expand simple
	definitions of ssa names in condition.  Split recusive part to ...
	(tree_simplify_using_condition_1): New function.
	(expand_simple_operations): New function.

	* gcc.dg/vect/vect-99.c: New test.

From-SVN: r98635