re PR tree-optimization/71872 (ICE in inchash::add_expr, at tree.c:7782 - OEP_ADDRESS_OF asserted for ADDR_EXPR applied to constant)

	PR tree-optimization/71872
	* tree-data-ref.c (get_references_in_stmt): Ignore references
	with is_gimple_constant get_base_address.

	* gcc.c-torture/compile/pr71872.c: New test.

From-SVN: r238351