Remove special debug ExternalReferences.

src/serialize.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_SERIALIZE_H_
 #define V8_SERIALIZE_H_
 
 #include "hashmap.h"
 
 namespace v8 {
 namespace internal {
 
 // A TypeCode is used to distinguish different kinds of external reference.
 // It is a single bit to make testing for types easy.
 enum TypeCode {
   UNCLASSIFIED,        // One-of-a-kind references.
   BUILTIN,
   RUNTIME_FUNCTION,
   IC_UTILITY,
-  DEBUG_ADDRESS,
   STATS_COUNTER,
   TOP_ADDRESS,
   C_BUILTIN,
   EXTENSION,
   ACCESSOR,
   RUNTIME_ENTRY,
   STUB_CACHE_TABLE,
   LAZY_DEOPTIMIZATION
 };
 
 const int kTypeCodeCount = LAZY_DEOPTIMIZATION + 1;
 const int kFirstTypeCode = UNCLASSIFIED;
 
 const int kReferenceIdBits = 16;
 const int kReferenceIdMask = (1 << kReferenceIdBits) - 1;
 const int kReferenceTypeShift = kReferenceIdBits;
-const int kDebugRegisterBits = 4;
-const int kDebugIdShift = kDebugRegisterBits;
 
 const int kDeoptTableSerializeEntryCount = 12;
 
 // ExternalReferenceTable is a helper class that defines the relationship
 // between external references and their encodings. It is used to build
 // hashmaps in ExternalReferenceEncoder and ExternalReferenceDecoder.
 class ExternalReferenceTable {
  public:
   static ExternalReferenceTable* instance(Isolate* isolate);
 
@@ skipping 594 matching lines @@
  private:
   virtual bool ShouldBeInThePartialSnapshotCache(HeapObject* o) {
     return false;
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_