VM: Move representation selection code out of the flow graph optimizer.

runtime/vm/flow_graph_optimizer.h

Index: runtime/vm/flow_graph_optimizer.h
diff --git a/runtime/vm/flow_graph_optimizer.h b/runtime/vm/flow_graph_optimizer.h
index 79abf12f1d6ffdbd59136180a467c220eb921b4f..311d3081c8e0efb8009fe04ef7b228ce5dd2234e 100644
--- a/runtime/vm/flow_graph_optimizer.h
+++ b/runtime/vm/flow_graph_optimizer.h
@@ -45,18 +45,6 @@ class FlowGraphOptimizer : public FlowGraphVisitor {
   // Merge instructions (only per basic-block).
   void TryOptimizePatterns();
 
-  // Returns true if any instructions were canonicalized away.
-  bool Canonicalize();
-
-  void EliminateDeadPhis();
-
-  void SelectRepresentations();
-
-  void WidenSmiToInt32();
-
-  // Remove environments from the instructions which do not deoptimize.
-  void EliminateEnvironments();
-
   virtual void VisitStaticCall(StaticCallInstr* instr);
   virtual void VisitInstanceCall(InstanceCallInstr* instr);
   virtual void VisitStoreInstanceField(StoreInstanceFieldInstr* instr);
@@ -138,15 +126,6 @@ class FlowGraphOptimizer : public FlowGraphVisitor {
 
   void ReplaceCall(Definition* call, Definition* replacement);
 
-  void InsertConversionsFor(Definition* def);
-
-  void ConvertUse(Value* use, Representation from);
-  void ConvertEnvironmentUse(Value* use, Representation from);
-
-  void InsertConversion(Representation from,
-                        Representation to,
-                        Value* use,
-                        bool is_environment_use);
 
   bool InstanceCallNeedsClassCheck(InstanceCallInstr* call,
                                    RawFunction::Kind kind) const;