Initial design for background compilation

runtime/vm/flow_graph_optimizer.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/compiler.h"
 #include "vm/cpu.h"
@@ skipping 2288 matching lines @@
   } else {
     return false;
   }
   ASSERT(unary_op != NULL);
   ReplaceCall(call, unary_op);
   return true;
 }
 
 
 // Using field class
-static RawField* GetField(intptr_t class_id, const String& field_name) {
-  Isolate* isolate = Isolate::Current();
-  Class& cls = Class::Handle(isolate, isolate->class_table()->At(class_id));
-  Field& field = Field::Handle(isolate);
+RawField* FlowGraphOptimizer::GetField(intptr_t class_id,
+                                       const String& field_name) {
+  Class& cls = Class::Handle(Z, isolate()->class_table()->At(class_id));
+  Field& field = Field::Handle(Z);
   while (!cls.IsNull()) {
     field = cls.LookupInstanceField(field_name);
     if (!field.IsNull()) {
       return field.raw();
     }
     cls = cls.SuperClass();
   }
   return Field::null();
 }
 
@@ skipping 6467 matching lines @@
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits_collector_.exits().length(); i++) {
     CreateMaterializationAt(
         exits_collector_.exits()[i], alloc, *slots);
   }
 }
 
 
 }  // namespace dart