Move reusable handles from isolate to thread.

runtime/vm/gc_marker.cc

 // Copyright (c) 2011, 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/gc_marker.h"
 
 #include <map>
 #include <utility>
 #include <vector>
 
@@ skipping 388 matching lines @@
   }
   if (!raw_obj->IsOldObject()) {
     return false;
   }
   return !raw_obj->IsMarked();
 }
 
 
 class MarkingWeakVisitor : public HandleVisitor {
  public:
-  MarkingWeakVisitor() : HandleVisitor(Isolate::Current()) {
+  MarkingWeakVisitor() : HandleVisitor(Thread::Current()) {
   }
 
   void VisitHandle(uword addr) {
     FinalizablePersistentHandle* handle =
         reinterpret_cast<FinalizablePersistentHandle*>(addr);
     RawObject* raw_obj = handle->raw();
     if (IsUnreachable(raw_obj)) {
-      handle->UpdateUnreachable(isolate());
+      handle->UpdateUnreachable(thread()->isolate());
     }
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MarkingWeakVisitor);
 };
 
 
 void GCMarker::Prologue(Isolate* isolate, bool invoke_api_callbacks) {
   if (invoke_api_callbacks && (isolate->gc_prologue_callback() != NULL)) {
@@ skipping 280 matching lines @@
       barrier.Exit();
     }
     delay_set.ClearReferences();
     ProcessWeakTables(page_space);
     ProcessObjectIdTable(isolate);
   }
   Epilogue(isolate, invoke_api_callbacks);
 }
 
 }  // namespace dart