2008-10-04  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-sccvn.c (vn_reference_op_eq): Use types_compatible_p
	instead of pointer equality.
	(vn_nary_op_eq): Likewise.

	* gcc.dg/tree-ssa/ssa-pre-21.c: New testcase.

From-SVN: r140868