Add support for enabling DCHECKs in release mode

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 2129 matching lines @@
   void PrintTransitions(std::ostream& os);  // NOLINT
 #endif
 
   static void PrintElementsTransition(
       FILE* file, Handle<JSObject> object,
       ElementsKind from_kind, Handle<FixedArrayBase> from_elements,
       ElementsKind to_kind, Handle<FixedArrayBase> to_elements);
 
   void PrintInstanceMigration(FILE* file, Map* original_map, Map* new_map);
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   // Structure for collecting spill information about JSObjects.
   class SpillInformation {
    public:
     void Clear();
     void Print();
     int number_of_objects_;
     int number_of_objects_with_fast_properties_;
     int number_of_objects_with_fast_elements_;
     int number_of_fast_used_fields_;
     int number_of_fast_unused_fields_;
@@ skipping 903 matching lines @@
   static const int kDescriptorSize = 3;
 
 #ifdef OBJECT_PRINT
   // For our gdb macros, we should perhaps change these in the future.
   void Print();
 
   // Print all the descriptors.
   void PrintDescriptors(std::ostream& os);  // NOLINT
 #endif
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   // Is the descriptor array sorted and without duplicates?
   bool IsSortedNoDuplicates(int valid_descriptors = -1);
 
   // Is the descriptor array consistent with the back pointers in targets?
   bool IsConsistentWithBackPointers(Map* current_map);
 
   // Are two DescriptorArrays equal?
   bool IsEqualTo(DescriptorArray* other);
 #endif
 
@@ skipping 5489 matching lines @@
   inline bool IsIndirect();
   inline bool IsExternalOneByte();
   inline bool IsExternalTwoByte();
   inline bool IsSequentialOneByte();
   inline bool IsSequentialTwoByte();
   inline bool IsInternalized();
   inline StringRepresentationTag representation_tag();
   inline uint32_t encoding_tag();
   inline uint32_t full_representation_tag();
   inline uint32_t size_tag();
-#ifdef DEBUG
+#if DCHECK_IS_ON
   inline uint32_t type() { return type_; }
   inline void invalidate() { valid_ = false; }
   inline bool valid() { return valid_; }
 #else
   inline void invalidate() { }
 #endif
 
  private:
   uint32_t type_;
-#ifdef DEBUG
+#if DCHECK_IS_ON
   inline void set_valid() { valid_ = true; }
   bool valid_;
 #else
   inline void set_valid() { }
 #endif
 };
 
 
 // The Name abstract class captures anything that can be used as a property
 // name, i.e., strings and symbols.  All names store a hash value.
@@ skipping 2400 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_