--- old/src/share/vm/ci/ciValueKlass.hpp	2016-12-02 14:22:05.959886118 +0100
+++ new/src/share/vm/ci/ciValueKlass.hpp	2016-12-02 14:22:05.675886109 +0100
@@ -48,7 +48,13 @@
   int       param_count() const;
   int       param_size();
 
-  // Value type fields ('index' refers to the value factory parameter index)
+  // Value type fields
+  //
+  // The term index refers to the index in the VM's constant pool
+  // (i.e., to the value returned by fieldDescriptor::index()).
+  // Argument index refers to a field's index in the value factory
+  // parameter mapping.
+  int       field_index_for_argument(int arg_index);
   int       get_field_count() { return nof_nonstatic_fields(); }
   int       get_field_index_by_offset(int offset);
   int       get_field_offset_by_index(int index) const;