diff -r eac007780a58 -r b8f5ba577b02 src/share/vm/opto/type.hpp
--- a/src/share/vm/opto/type.hpp	Thu Mar 13 16:06:34 2008 -0700
+++ b/src/share/vm/opto/type.hpp	Thu Mar 13 16:31:32 2008 -0700
@@ -686,6 +686,7 @@
   bool klass_is_exact()    const { return _klass_is_exact; }
   bool is_instance()       const { return _instance_id != UNKNOWN_INSTANCE; }
   uint instance_id()       const { return _instance_id; }
+  bool is_instance_field() const { return _instance_id != UNKNOWN_INSTANCE && _offset >= 0; }
 
   virtual intptr_t get_con() const;