Moves the top_ and end_ words of the Scavenger into mutator thread.

runtime/vm/thread.cc

 // Copyright (c) 2015, 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/thread.h"
 
 #include "vm/compiler_stats.h"
 #include "vm/dart_api_state.h"
 #include "vm/growable_array.h"
 #include "vm/isolate.h"
@@ skipping 82 matching lines @@
       deferred_interrupts_(0),
       stack_overflow_count_(0),
       cha_(NULL),
       deopt_id_(0),
       pending_functions_(GrowableObjectArray::null()),
       active_exception_(Object::null()),
       active_stacktrace_(Object::null()),
       resume_pc_(0),
       sticky_error_(Error::null()),
       compiler_stats_(NULL),
+      top_(0),
+      end_(0),
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_INITIALIZERS)
           REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_SCOPE_INIT) safepoint_state_(0),
       execution_state_(kThreadInNative),
       next_(NULL) {
 #if !defined(PRODUCT)
   dart_stream_ = Timeline::GetDartStream();
   ASSERT(dart_stream_ != NULL);
 #endif
 #define DEFAULT_INIT(type_name, member_name, init_expr, default_init_value)    \
   member_name = default_init_value;
@@ skipping 810 matching lines @@
 
 DisableThreadInterruptsScope::~DisableThreadInterruptsScope() {
   if (thread() != NULL) {
     OSThread* os_thread = thread()->os_thread();
     ASSERT(os_thread != NULL);
     os_thread->EnableThreadInterrupts();
   }
 }
 
 }  // namespace dart