Some cleanup for become.

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 602 matching lines @@
 void IsolateReloadContext::Rollback() {
   I->object_store()->set_compile_time_constants(
       Array::Handle(compile_time_constants_));
   RollbackClasses();
   RollbackLibraries();
 }
 
 
 #ifdef DEBUG
 void IsolateReloadContext::VerifyMaps() {
+  TIMELINE_SCOPE(VerifyMaps);
   Class& cls = Class::Handle();
   Class& new_cls = Class::Handle();
   Class& cls2 = Class::Handle();
   Class& new_cls2 = Class::Handle();
 
   // Verify that two old classes aren't both mapped to the same new
   // class.  This could happen is the IsSameClass function is broken.
   UnorderedHashMap<ClassMapTraits> class_map(class_map_storage_);
   {
     UnorderedHashMap<ClassMapTraits>::Iterator it(&class_map);
@@ skipping 525 matching lines @@
         ASSERT(!super_cls.IsNull());
         super_cls.AddDirectSubclass(cls);
       }
     }
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart