Add support for enabling DCHECKs in release mode

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index b56e9215ab35d5d4c22b11f8eab3af9128fc6e58..1c5bd808fbc3c5714de6e7d2596ac8907ed00fd5 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -259,7 +259,7 @@ class Range FINAL : public ZoneObject {
     upper_ = Min(upper_, Smi::kMaxValue);
   }
   void KeepOrder();
-#ifdef DEBUG
+#if DCHECK_IS_ON
   void Verify() const;
 #endif
 
@@ -559,7 +559,7 @@ class HValue : public ZoneObject {
         type_(type),
         use_list_(NULL),
         range_(NULL),
-#ifdef DEBUG
+#if DCHECK_IS_ON
         range_poisoned_(false),
 #endif
         flags_(0) {}
@@ -739,7 +739,7 @@ class HValue : public ZoneObject {
     DCHECK(!range_poisoned_);
     return range_ != NULL;
   }
-#ifdef DEBUG
+#if DCHECK_IS_ON
   void PoisonRange() { range_poisoned_ = true; }
 #endif
   void AddNewRange(Range* r, Zone* zone);
@@ -803,7 +803,7 @@ class HValue : public ZoneObject {
     return HasObservableSideEffects() || !IsDeletable();
   }
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   virtual void Verify() = 0;
 #endif
 
@@ -916,7 +916,7 @@ class HValue : public ZoneObject {
   HType type_;
   HUseListNode* use_list_;
   Range* range_;
-#ifdef DEBUG
+#if DCHECK_IS_ON
   bool range_poisoned_;
 #endif
   int flags_;
@@ -1196,7 +1196,7 @@ class HInstruction : public HValue {
 
   virtual LInstruction* CompileToLithium(LChunkBuilder* builder) = 0;
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   virtual void Verify() OVERRIDE;
 #endif
 
@@ -1875,7 +1875,7 @@ class HSimulate FINAL : public HInstruction {
 
   DECLARE_CONCRETE_INSTRUCTION(Simulate)
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   virtual void Verify() OVERRIDE;
   void set_closure(Handle<JSFunction> closure) { closure_ = closure; }
   Handle<JSFunction> closure() const { return closure_; }
@@ -1919,7 +1919,7 @@ class HSimulate FINAL : public HInstruction {
   Zone* zone_;
   uint32_t bit_field_;
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   Handle<JSFunction> closure_;
 #endif
 };
@@ -1944,7 +1944,7 @@ class HEnvironmentMarker FINAL : public HTemplateInstruction<1> {
 
   virtual std::ostream& PrintDataTo(std::ostream& os) const OVERRIDE;  // NOLINT
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   void set_closure(Handle<JSFunction> closure) {
     DCHECK(closure_.is_null());
     DCHECK(!closure.is_null());
@@ -1963,7 +1963,7 @@ class HEnvironmentMarker FINAL : public HTemplateInstruction<1> {
   int index_;
   HSimulate* next_simulate_;
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   Handle<JSFunction> closure_;
 #endif
 };
@@ -2910,7 +2910,7 @@ class HCheckValue FINAL : public HUnaryOperation {
 
   virtual HValue* Canonicalize() OVERRIDE;
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   virtual void Verify() OVERRIDE;
 #endif
 
@@ -3046,7 +3046,7 @@ class HCheckHeapObject FINAL : public HUnaryOperation {
     return HType::HeapObject();
   }
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   virtual void Verify() OVERRIDE;
 #endif
 
@@ -3347,7 +3347,7 @@ class HPhi FINAL : public HValue {
 
   virtual std::ostream& PrintTo(std::ostream& os) const OVERRIDE;  // NOLINT
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   virtual void Verify() OVERRIDE;
 #endif
 
@@ -3739,7 +3739,7 @@ class HConstant FINAL : public HTemplateInstruction<0> {
     }
   }
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   virtual void Verify() OVERRIDE { }
 #endif
 
@@ -7677,7 +7677,7 @@ class HToFastProperties FINAL : public HUnaryOperation {
     // change the map of the input operand. Use it only when creating
     // object literals via a runtime call.
     DCHECK(value->IsCallRuntime());
-#ifdef DEBUG
+#if DCHECK_IS_ON
     const Runtime::Function* function = HCallRuntime::cast(value)->function();
     DCHECK(function->function_id == Runtime::kCreateObjectLiteral);
 #endif