Add back references. Since "back references" is two words...

src/regexp-macro-assembler-re2k.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 156 matching lines @@
 void RegExpMacroAssemblerRe2k::CheckCharacter(uc16 c, Label* on_equal) {
   assembler_->CheckCharacter(c, on_equal);
 }
 
 
 void RegExpMacroAssemblerRe2k::CheckNotCharacter(uc16 c, Label* on_not_equal) {
   assembler_->CheckNotCharacter(c, on_not_equal);
 }
 
 
+void RegExpMacroAssemblerRe2k::CheckNotBackReference(int start_reg, Label* on_not_equal) {
+  assembler_->CheckNotBackReference(start_reg, on_not_equal);
+}
+
+
 void RegExpMacroAssemblerRe2k::CheckBitmap(uc16 start,
                                            Label* bitmap,
                                            Label* on_zero) {
   assembler_->LookupMap1(start, bitmap, on_zero);
 }
 
 
 void RegExpMacroAssemblerRe2k::DispatchHalfNibbleMap(
     uc16 start,
     Label* half_nibble_map,
@@ skipping 44 matching lines @@
 }
 
 
 Handle<Object> RegExpMacroAssemblerRe2k::GetCode() {
   Handle<ByteArray> array = Factory::NewByteArray(assembler_->length());
   assembler_->Copy(array->GetDataStartAddress());
   return array;
 }
 
 } }  // namespace v8::internal