Add support for enabling DCHECKs in release mode

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index 554ba8e7b17f272e5f4dbfbad51df460343bcc8a..c518578340144431c48692884182919bd1389666 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -605,10 +605,10 @@ Deoptimizer::Deoptimizer(Isolate* isolate,
       : StackFrame::JAVA_SCRIPT;
   trace_scope_ = TraceEnabledFor(type, frame_type) ?
       new CodeTracer::Scope(isolate->GetCodeTracer()) : NULL;
-#ifdef DEBUG
-  CHECK(AllowHeapAllocation::IsAllowed());
+#if DCHECK_IS_ON
+  DCHECK(AllowHeapAllocation::IsAllowed());
   disallow_heap_allocation_ = new DisallowHeapAllocation();
-#endif  // DEBUG
+#endif  // DCHECK_IS_ON
   unsigned size = ComputeInputFrameSize();
   input_ = new(size) FrameDescription(size, function);
   input_->SetFrameType(frame_type);
@@ -660,12 +660,12 @@ void Deoptimizer::DeleteFrameDescriptions() {
   delete[] output_;
   input_ = NULL;
   output_ = NULL;
-#ifdef DEBUG
-  CHECK(!AllowHeapAllocation::IsAllowed());
-  CHECK(disallow_heap_allocation_ != NULL);
+#if DCHECK_IS_ON
+  DCHECK(!AllowHeapAllocation::IsAllowed());
+  DCHECK(disallow_heap_allocation_ != NULL);
   delete disallow_heap_allocation_;
   disallow_heap_allocation_ = NULL;
-#endif  // DEBUG
+#endif  // DCHECK_IS_ON
 }