Use the instruction iterator rather than an explicit loop in more places.

runtime/vm/flow_graph_optimizer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_FLOW_GRAPH_OPTIMIZER_H_
 #define VM_FLOW_GRAPH_OPTIMIZER_H_
 
 #include "vm/intermediate_language.h"
 
 namespace dart {
@@ skipping 15 matching lines @@
   virtual void VisitStoreIndexed(StoreIndexedComp* comp, BindInstr* instr);
   virtual void VisitRelationalOp(RelationalOpComp* comp, BindInstr* instr);
 
   virtual void VisitStrictCompare(StrictCompareComp* comp, BindInstr* instr);
   virtual void VisitEqualityCompare(EqualityCompareComp* comp,
                                     BindInstr* instr);
 
   virtual void VisitBind(BindInstr* instr);
 
  private:
-  void VisitBlocks();
-
   bool TryReplaceWithBinaryOp(BindInstr* instr,
                               InstanceCallComp* comp,
                               Token::Kind op_kind);
   bool TryReplaceWithUnaryOp(BindInstr* instr,
                              InstanceCallComp* comp,
                              Token::Kind op_kind);
 
   bool TryInlineInstanceGetter(BindInstr* instr,
                                InstanceCallComp* comp);
   bool TryInlineInstanceSetter(BindInstr* instr, InstanceSetterComp* comp);
 
   bool TryInlineInstanceMethod(BindInstr* instr, InstanceCallComp* comp);
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphOptimizer);
 };
 
 
 // Analyze the generated flow graph. Currently only if it is a leaf
 // method, i.e., does not contain any calls to runtime or other Dart code.
 class FlowGraphAnalyzer : public ValueObject {
  public:
-  explicit FlowGraphAnalyzer(const GrowableArray<BlockEntryInstr*>& blocks);
+  explicit FlowGraphAnalyzer(const GrowableArray<BlockEntryInstr*>& blocks)
+      : blocks_(blocks), is_leaf_(false) {}
   virtual ~FlowGraphAnalyzer() {}
 
   void Analyze();
 
   bool is_leaf() const { return is_leaf_; }
 
  private:
   const GrowableArray<BlockEntryInstr*>& blocks_;
   bool is_leaf_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphAnalyzer);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_OPTIMIZER_H_