re PR tree-optimization/69270 (DOM should exploit range information to create more equivalences)

	PR tree-optimization/69270
	* tree-ssanames.c (ssa_name_has_boolean_range): Moved here from
	tree-ssa-dom.c.  Improve test for [0..1] ranve from VRP.
	* tree-ssa-dom.c (ssa_name_has_boolean_range): Remove.
	* tree-ssanames.h (ssa_name_has_boolean_range): Prototype.
	* tree-ssa-uncprop.c (associate_equivalences_with_edges): Use
	ssa_name_has_boolean_range and constant_boolean_node.

	PR tree-optimization/69270
	* gcc.dg/tree-ssa/pr69270-2.c: New test.
	* gcc.dg/tree-ssa/pr69270-3.c: New test.

From-SVN: r232453