Fix for use-after-free of reload context

runtime/vm/isolate_reload.cc

 // Copyright (c) 2016, 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/isolate_reload.h"
 
 #include "vm/become.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
@@ skipping 159 matching lines @@
 bool IsolateReloadContext::IsSameLibrary(
     const Library& a_lib, const Library& b_lib) {
   const String& a_lib_url =
       String::Handle(a_lib.IsNull() ? String::null() : a_lib.url());
   const String& b_lib_url =
       String::Handle(b_lib.IsNull() ? String::null() : b_lib.url());
   return a_lib_url.Equals(b_lib_url);
 }
 
 
-IsolateReloadContext::IsolateReloadContext(Isolate* isolate, bool test_mode)
+IsolateReloadContext::IsolateReloadContext(Isolate* isolate)
     : start_time_micros_(OS::GetCurrentMonotonicMicros()),
       isolate_(isolate),
-      test_mode_(test_mode),
       has_error_(false),
       saved_num_cids_(-1),
       saved_class_table_(NULL),
       num_saved_libs_(-1),
       script_uri_(String::null()),
       error_(Error::null()),
       old_classes_set_storage_(Array::null()),
       class_map_storage_(Array::null()),
       old_libraries_set_storage_(Array::null()),
       library_map_storage_(Array::null()),
@@ skipping 938 matching lines @@
         ASSERT(!super_cls.IsNull());
         super_cls.AddDirectSubclass(cls);
       }
     }
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart