Incorporate some review comments.

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
diff --git a/runtime/vm/intermediate_language.h b/runtime/vm/intermediate_language.h
index edd92bbaf56d7c49a322af6d263ebc57f23178df..8a40a22ac546b44290e17825b72ae027ab954287 100644
--- a/runtime/vm/intermediate_language.h
+++ b/runtime/vm/intermediate_language.h
@@ -212,6 +212,8 @@ FOR_EACH_INSTRUCTION(INSTRUCTION_TYPE_CHECK)
 
  private:
   bool mark_;
+
+  DISALLOW_COPY_AND_ASSIGN(Instruction);
 };
 
 
@@ -236,6 +238,8 @@ class BlockEntryInstr : public Instruction {
 
  private:
   intptr_t block_number_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlockEntryInstr);
 };
 
 
@@ -254,12 +258,14 @@ class JoinEntryInstr : public BlockEntryInstr {
 
  private:
   Instruction* successor_;
+
+  DISALLOW_COPY_AND_ASSIGN(JoinEntryInstr);
 };
 
 
 class TargetEntryInstr : public BlockEntryInstr {
  public:
-  TargetEntryInstr() : BlockEntryInstr(), block_number_(-1), successor_(NULL) {
+  TargetEntryInstr() : BlockEntryInstr(), successor_(NULL) {
   }
 
   DECLARE_INSTRUCTION(TargetEntry)
@@ -272,8 +278,9 @@ class TargetEntryInstr : public BlockEntryInstr {
   virtual void Postorder(GrowableArray<BlockEntryInstr*>* block_entries);
 
  private:
-  intptr_t block_number_;
   Instruction* successor_;
+
+  DISALLOW_COPY_AND_ASSIGN(TargetEntryInstr);
 };
 
 
@@ -296,6 +303,8 @@ class DoInstr : public Instruction {
  private:
   Computation* computation_;
   Instruction* successor_;
+
+  DISALLOW_COPY_AND_ASSIGN(DoInstr);
 };
 
 
@@ -323,6 +332,8 @@ class BindInstr : public Instruction {
   const intptr_t temp_index_;
   Computation* computation_;
   Instruction* successor_;
+
+  DISALLOW_COPY_AND_ASSIGN(BindInstr);
 };
 
 
@@ -340,6 +351,8 @@ class ReturnInstr : public Instruction {
 
  private:
   Value* value_;
+
+  DISALLOW_COPY_AND_ASSIGN(ReturnInstr);
 };
 
 
@@ -368,6 +381,8 @@ class BranchInstr : public Instruction {
   Value* value_;
   TargetEntryInstr* true_successor_;
   TargetEntryInstr* false_successor_;
+
+  DISALLOW_COPY_AND_ASSIGN(BranchInstr);
 };
 
 #undef DECLARE_INSTRUCTION