Eliminate calls to Isolate::Current from the flow-graph builder.

runtime/vm/flow_graph_builder.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_BUILDER_H_
 #define VM_FLOW_GRAPH_BUILDER_H_
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/allocation.h"
@@ skipping 327 matching lines @@
   // actually added to the graph.
   void AddReturnExit(intptr_t token_pos, Value* value);
 
  protected:
   Definition* BuildStoreTemp(const LocalVariable& local, Value* value);
   Definition* BuildStoreExprTemp(Value* value);
   Definition* BuildLoadExprTemp();
 
   Definition* BuildStoreLocal(const LocalVariable& local, Value* value);
   Definition* BuildLoadLocal(const LocalVariable& local);
+  LoadLocalInstr* BuildLoadThisVar(LocalScope* scope);
 
   // Helpers for translating parts of the AST.
   void BuildPushArguments(const ArgumentListNode& node,
                           ZoneGrowableArray<PushArgumentInstr*>* values);
 
   // Creates an instantiated type argument vector used in preparation of an
   // allocation call.
   // May be called only if allocating an object of a parameterized class.
   Value* BuildInstantiatedTypeArguments(
       intptr_t token_pos,
@@ skipping 229 matching lines @@
   // Output parameters.
   GrowableArray<TargetEntryInstr**> true_successor_addresses_;
   GrowableArray<TargetEntryInstr**> false_successor_addresses_;
 
   intptr_t condition_token_pos_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_