tree-ssa-dom.c (hashable_expr_equal_p): Also compare the EH region of calls to pure functions that can throw an exception.

	* tree-ssa-dom.c (hashable_expr_equal_p) <EXPR_CALL>: Also compare the
	EH region of calls to pure functions that can throw an exception.
	* tree-ssa-sccvn.c (vn_reference_eq): Remove duplicated test.
	(copy_reference_ops_from_call): Also copy the EH region of the call if
	it can throw an exception.

From-SVN: r210649