* tree-ssa-dom.c (edge_info::record_simple_equiv): Call
	derive_equivalences.
	(derive_equivalences_from_bit_ior, record_temporary_equivalences):
	Code moved into....
	(edge_info::derive_equivalences): New private member function

	* gcc.dg/torture/pr57214.c: Fix type of loop counter.
	* gcc.dg/tree-ssa/ssa-sink-16.c: Disable DOM.
	* gcc.dg/tree-ssa/ssa-dom-thread-11.c: New test.
	* gcc.dg/tree-ssa/ssa-dom-thread-12.c: New test.
	* gcc.dg/tree-ssa/ssa-dom-thread-13.c: New test.
	* gcc.dg/tree-ssa/ssa-dom-thread-14.c: New test.
	* gcc.dg/tree-ssa/ssa-dom-thread-15.c: New test.
	* gcc.dg/tree-ssa/ssa-dom-thread-16.c: New test.
	* gcc.dg/tree-ssa/ssa-dom-thread-17.c: New test.

From-SVN: r251397