Ensure that all phis inserted by load optimizer have consistent representation.

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"
 #include "vm/flow_graph.h"
 
@@ skipping 24 matching lines @@
   // shift can be a truncating Smi shift-left and result is always Smi.
   void TryOptimizeLeftShiftWithBitAndPattern();
 
   // Returns true if any instructions were canonicalized away.
   bool Canonicalize();
 
   void EliminateDeadPhis();
 
   void SelectRepresentations();
 
+  void UnboxPhis();
+
   void InferSmiRanges();
 
   void AnalyzeTryCatch();
 
   // Remove environments from the instructions which do not deoptimize.
   void EliminateEnvironments();
 
   virtual void VisitStaticCall(StaticCallInstr* instr);
   virtual void VisitInstanceCall(InstanceCallInstr* instr);
   virtual void VisitRelationalOp(RelationalOpInstr* instr);
@@ skipping 71 matching lines @@
 
   // Add a class check for a call's first argument immediately before the
   // call, using the call's IC data to determine the check, and the call's
   // deopt ID and deoptimization environment if the check fails.
   void AddReceiverCheck(InstanceCallInstr* call);
 
   void ReplaceCall(Definition* call, Definition* replacement);
 
   void InsertConversionsFor(Definition* def);
 
+  void ConvertUse(Value* use, Representation from);
+
   void InsertConversion(Representation from,
                         Representation to,
                         Value* use,
                         Instruction* insert_before,
                         Instruction* deopt_target);
 
   bool InstanceCallNeedsClassCheck(InstanceCallInstr* call) const;
   bool MethodExtractorNeedsClassCheck(InstanceCallInstr* call) const;
 
   bool InlineFloat32x4Getter(InstanceCallInstr* call,
@@ skipping 217 matching lines @@
 // Optimize spill stores inside try-blocks by identifying values that always
 // contain a single known constant at catch block entry.
 class TryCatchAnalyzer : public AllStatic {
  public:
   static void Optimize(FlowGraph* flow_graph);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_OPTIMIZER_H_