Add support for enabling DCHECKs in release mode

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index f2ce8a1c9b90e28b4a0976913b1f2608fe102ada..0d822c8462b0024d0479e6c683145d87ac3d91cd 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -176,7 +176,7 @@ HSimulate* HBasicBlock::CreateSimulate(BailoutId ast_id,
 
   HSimulate* instr =
       new(zone()) HSimulate(ast_id, pop_count, zone(), removable);
-#ifdef DEBUG
+#if DCHECK_IS_ON
   instr->set_closure(environment->closure());
 #endif
   // Order of pushed values: newest (top of stack) first. This allows
@@ -462,7 +462,7 @@ int HBasicBlock::PredecessorIndexOf(HBasicBlock* predecessor) const {
 }
 
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
 void HBasicBlock::Verify() {
   // Check that every block is finished.
   DCHECK(IsFinished());
@@ -513,7 +513,7 @@ void HLoopInformation::AddBlock(HBasicBlock* block) {
 }
 
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
 
 // Checks reachability of the blocks in this graph and stores a bit in
 // the BitVector "reachable()" for every block that can be reached
@@ -3851,7 +3851,7 @@ class PostorderProcessor : public ZoneObject {
 void HGraph::OrderBlocks() {
   CompilationPhase phase("H_Block ordering", info());
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   // Initially the blocks must not be ordered.
   for (int i = 0; i < blocks_.length(); ++i) {
     DCHECK(!blocks_[i]->IsOrdered());
@@ -3865,7 +3865,7 @@ void HGraph::OrderBlocks() {
     postorder = postorder->PerformStep(zone(), &blocks_);
   }
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   // Now all blocks must be marked as ordered.
   for (int i = 0; i < blocks_.length(); ++i) {
     DCHECK(blocks_[i]->IsOrdered());
@@ -4014,7 +4014,7 @@ AstContext::AstContext(HOptimizedGraphBuilder* owner, Expression::Context kind)
       outer_(owner->ast_context()),
       for_typeof_(false) {
   owner->set_ast_context(this);  // Push.
-#ifdef DEBUG
+#if DCHECK_IS_ON
   DCHECK(owner->environment()->frame_type() == JS_FUNCTION);
   original_length_ = owner->environment()->length();
 #endif
@@ -4375,7 +4375,7 @@ bool HGraph::Optimize(BailoutReason* bailout_reason) {
   // evaluates relations with "zero" and that zero cannot be created after GVN.
   GetConstant0();
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   // Do a full verify after building the graph and computing dominators.
   Verify(true);
 #endif
@@ -4460,7 +4460,7 @@ void HGraph::RestoreActualValues() {
   for (int block_index = 0; block_index < blocks()->length(); block_index++) {
     HBasicBlock* block = blocks()->at(block_index);
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
     for (int i = 0; i < block->phis()->length(); i++) {
       HPhi* phi = block->phis()->at(i);
       DCHECK(phi->ActualValue() == phi);
@@ -13020,7 +13020,7 @@ HPhase::~HPhase() {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   graph_->Verify(false);  // No full verify.
 #endif
 }