Remove some Isolate::current_zone() calls, as it gets the zone from mutator thread not the current …

runtime/vm/compiler.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_COMPILER_H_
 #define VM_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 #include "vm/runtime_entry.h"
@@ skipping 88 matching lines @@
   static bool always_optimize_;
   static bool allow_recompilation_;
 };
 
 
 // Class to run optimizing compilation in a background thread.
 // Current implementation: one task per isolate, it dies with the owning
 // isolate.
 class BackgroundCompiler : public ThreadPool::Task {
  public:
-  static void EnsureInit(Isolate* isolate);
+  static void EnsureInit(Thread* thread);
 
   static void Stop(BackgroundCompiler* task);
 
   void CompileOptimized(const Function& function);
 
  private:
   explicit BackgroundCompiler(Isolate* isolate);
 
   virtual void Run();
 
   void Add(const Function& f) const;
   RawFunction* RemoveOrNull() const;
 
   Isolate* isolate_;
   bool running_;
   bool* done_;
   Monitor* monitor_;
   Monitor* done_monitor_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(BackgroundCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_COMPILER_H_