re PR tree-optimization/52267 (a&~N where N has all the bits set up till a specific point can be folded to ((unsigned)a) < N)

	PR tree-optimization/52267
	* tree-vrp.c (masked_increment): New function.
	(register_edge_assert_for_2): Derive ASSERT_EXPRs
	from (X & CST1) cmp CST2 tests.

	* gcc.dg/pr52267.c: New test.
	* gcc.dg/tree-ssa/vrp65.c: New test.
	* gcc.dg/tree-ssa/vrp66.c: New test.

From-SVN: r185427