--- old/src/hotspot/share/oops/valueKlass.hpp	2019-11-21 11:03:16.537091191 +0100
+++ new/src/hotspot/share/oops/valueKlass.hpp	2019-11-21 11:03:16.265086575 +0100
@@ -195,6 +195,7 @@
 
   // allocate_instance() allocates a stand alone value in the Java heap
   instanceOop allocate_instance(TRAPS);
+  instanceOop allocate_instance_buffer(TRAPS);
 
   // minimum number of bytes occupied by nonstatic fields, HeapWord aligned or pow2
   int raw_value_byte_size();
@@ -273,6 +274,10 @@
     return byte_offset_of(ValueKlassFixedBlock, _default_value_offset);
   }
 
+  static ByteSize first_field_offset_offset() {
+    return byte_offset_of(ValueKlassFixedBlock, _first_field_offset);
+  }
+
   void set_default_value_offset(int offset) {
     *((int*)adr_default_value_offset()) = offset;
   }