2013-05-27  Richard Biener  <rguenther@suse.de>

	Revert
	PR middle-end/57381
	* fold-const.c (operand_equal_p): Compare FIELD_DECLs with
	OEP_CONSTANT_ADDRESS_OF retained.

	PR tree-optimization/57417
	* tree-ssa-sccvn.c (vn_reference_fold_indirect): Fix test
	for unchanged base.
	(set_ssa_val_to): Compare addresses using
	get_addr_base_and_unit_offset.

	* gcc.dg/torture/pr57417.c: New testcase.

From-SVN: r199356