Fix asserts in StackFrameIterator which were effectively disabled

runtime/vm/weak_code.cc

 // Copyright (c) 2014, 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/weak_code.h"
 
 #include "platform/assert.h"
 
 #include "vm/code_patcher.h"
 #include "vm/object.h"
@@ skipping 43 matching lines @@
     weak_property ^= dependent_code.At(i);
     if (code.raw() == weak_property.key()) {
       return true;
     }
   }
   return false;
 }
 
 
 void WeakCodeReferences::DisableCode() {
-  const Array& code_objects = Array::Handle(array_.raw());
+  Thread* thread = Thread::Current();
+  const Array& code_objects = Array::Handle(thread->zone(), array_.raw());
   if (code_objects.IsNull()) {
     return;
   }
   ASSERT(!FLAG_precompiled_runtime);
   UpdateArrayTo(Object::null_array());
   // Disable all code on stack.
   Code& code = Code::Handle();
   {
-    DartFrameIterator iterator;
+    DartFrameIterator iterator(thread,
+                               StackFrameIterator::kNoCrossThreadIteration);
     StackFrame* frame = iterator.NextFrame();
     while (frame != NULL) {
       code = frame->LookupDartCode();
       if (IsOptimizedCode(code_objects, code)) {
         ReportDeoptimization(code);
         DeoptimizeAt(code, frame);
       }
       frame = iterator.NextFrame();
     }
   }
@@ skipping 42 matching lines @@
       // Make non-OSR code non-entrant.
       if (!code.IsDisabled()) {
         ReportSwitchingCode(code);
         code.DisableDartCode();
       }
     }
   }
 }
 
 }  // namespace dart