PR tree-optimization/61289
	* tree-ssa-threadedge.c (invalidate_equivalences): Remove SRC_MAP and
	DST_MAP parameters.   Invalidate by walking all the SSA_NAME_VALUES
	looking for those which match LHS.  All callers changed.
	(record_temporary_equivalences_from_phis): Remove SRC_MAP and DST_MAP
	parameters and code which manipulated them.  All callers changed.
	(record_temporary_equivalences_from_stmts_at_dest): Remove SRC_MAP
	and DST_MAP parameters.  Simplify invalidation code by just calling
	invalidate_equivalences.  All callers changed.
	(thread_across_edge): Simplify now that we don't need to maintain
	the map of equivalences to invalidate.

        PR tree-optimization/61289
	* g++.dg/pr61289.C: New test.
	* g++.dg/pr61289-2.C: New test.

From-SVN: r211287