tree-vrp.c (test_for_singularity): Correct test for new min limit.

tree-vrp.c (test_for_singularity): Correct test for new min limit.

	* tree-vrp.c (test_for_singularity): Correct test for new
	min limit.  Use operand_equal_p rather than pointer equality
	for testing if new min/max values are equal.

	* tree-ssa-propagate.c (substitute_and_fold): Delay simplifications
	using range information until after propagation and folding.

	* gcc.c-torture/execute/930529-1.x: Use -fwrapv as test depends
	on wrapping on overflow semantics.

	* gcc.dg/tree-ssa/pr23109.c: Remove the .lim file too.

	* gcc.gc/tree-ssa/vrp23.c: New test.
	* gcc.gc/tree-ssa/vrp24.c: New test.

From-SVN: r109904