Add support for enabling DCHECKs in release mode

src/base/platform/mutex.cc

 // Copyright 2013 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.
 
 #include "src/base/platform/mutex.h"
 
 #include <errno.h>
 
 namespace v8 {
 namespace base {
@@ skipping 94 matching lines @@
 
 static V8_INLINE bool TryLockNativeHandle(PCRITICAL_SECTION cs) {
   return TryEnterCriticalSection(cs);
 }
 
 #endif  // V8_OS_POSIX
 
 
 Mutex::Mutex() {
   InitializeNativeHandle(&native_handle_);
-#ifdef DEBUG
+#if DCHECK_IS_ON
   level_ = 0;
 #endif
 }
 
 
 Mutex::~Mutex() {
   DestroyNativeHandle(&native_handle_);
   DCHECK_EQ(0, level_);
 }
 
@@ skipping 14 matching lines @@
   if (!TryLockNativeHandle(&native_handle_)) {
     return false;
   }
   AssertUnheldAndMark();
   return true;
 }
 
 
 RecursiveMutex::RecursiveMutex() {
   InitializeRecursiveNativeHandle(&native_handle_);
-#ifdef DEBUG
+#if DCHECK_IS_ON
   level_ = 0;
 #endif
 }
 
 
 RecursiveMutex::~RecursiveMutex() {
   DestroyNativeHandle(&native_handle_);
   DCHECK_EQ(0, level_);
 }
 
 
 void RecursiveMutex::Lock() {
   LockNativeHandle(&native_handle_);
-#ifdef DEBUG
+#if DCHECK_IS_ON
   DCHECK_LE(0, level_);
   level_++;
 #endif
 }
 
 
 void RecursiveMutex::Unlock() {
-#ifdef DEBUG
+#if DCHECK_IS_ON
   DCHECK_LT(0, level_);
   level_--;
 #endif
   UnlockNativeHandle(&native_handle_);
 }
 
 
 bool RecursiveMutex::TryLock() {
   if (!TryLockNativeHandle(&native_handle_)) {
     return false;
   }
-#ifdef DEBUG
+#if DCHECK_IS_ON
   DCHECK_LE(0, level_);
   level_++;
 #endif
   return true;
 }
 
 } }  // namespace v8::base