PR tree-optimization/60363
	* gcc/tree-ssa-threadupdate.c (get_value_locus_in_path): New.
	(copy_phi_args): New parameters.  Call get_value_locus_in_path.
	(update_destination_phis): New parameter.
	(create_edge_and_update_destination_phis): Ditto.
	(ssa_fix_duplicate_block_edges): Pass new arguments.
	(thread_single_edge): Ditto.

	PR tree-optimization/60363
	* gcc.dg/tree-ssa/ssa-dom-thread-4.c: Revert XFAIL test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@210059 138bc75d-0d04-0410-961f-82ee72b054a4