Various improvements regarding the way we print code code comments.

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index c1041326b4b3b0aa73feecabd0fb91ff0aa0f63d..7df1070310b34baa05882623eb9b2c8d5371eaa4 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -80,6 +80,15 @@ class LCodeGen BASE_EMBEDDED {
   Heap* heap() const { return isolate()->heap(); }
   Zone* zone() const { return zone_; }
 
+  // TODO(svenpanne) Use this consistently.
+  int LookupDestination(int block_id) const {
+    return chunk()->LookupDestination(block_id);
+  }
+
+  bool IsNextEmittedBlock(int block_id) const {
+    return LookupDestination(block_id) == GetNextEmittedBlock();
+  }
+
   bool NeedsEagerFrame() const {
     return GetStackSlotCount() > 0 ||
         info()->is_non_deferred_calling() ||
@@ -196,12 +205,12 @@ class LCodeGen BASE_EMBEDDED {
 
   LPlatformChunk* chunk() const { return chunk_; }
   Scope* scope() const { return scope_; }
-  HGraph* graph() const { return chunk_->graph(); }
+  HGraph* graph() const { return chunk()->graph(); }
 
   Register scratch0() { return r9; }
   DwVfpRegister double_scratch0() { return kScratchDoubleReg; }
 
-  int GetNextEmittedBlock();
+  int GetNextEmittedBlock() const;
   LInstruction* GetNextInstruction();
 
   void EmitClassOfTest(Label* if_true,