--- old/src/hotspot/share/oops/fieldStreams.hpp	2019-03-11 14:26:15.946355020 +0100
+++ new/src/hotspot/share/oops/fieldStreams.hpp	2019-03-11 14:26:15.714355023 +0100
@@ -38,6 +38,7 @@
 // AllFieldStream exposes all fields and should only be used in rare
 // cases.
 class FieldStreamBase : public StackObj {
+
  protected:
   Array<u2>*          _fields;
   constantPoolHandle  _constants;
@@ -161,6 +162,20 @@
     return field()->allocation_type();
   }
 
+  bool is_flattened() {
+    return field()->is_flattened();
+  }
+
+  void set_flattened(bool b) {
+    field()->set_flattened(b);
+  }
+
+  bool is_flattenable() const {
+    AccessFlags flags;
+    flags.set_flags(field()->access_flags());
+    return flags.is_flattenable();
+  }
+
   void set_offset(int offset) {
     field()->set_offset(offset);
   }