Support reloading from source on top of a script snapshot.

runtime/vm/object_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/object.h"
 
 #include "vm/hash_table.h"
 #include "vm/isolate_reload.h"
 #include "vm/log.h"
 #include "vm/resolver.h"
@@ skipping 525 matching lines @@
     const String& lib_url = String::Handle(to_.url());
     from_.ToCString();
     return String::NewFormatted(
         "Reloading support for deferred loading has not yet been implemented:"
         " library '%s' has deferred import '%s'",
         lib_url.ToCString(), name_.ToCString());
   }
 };
 
 
-// This is executed before interating over the instances.
+// This is executed before iterating over the instances.
 void Class::CheckReload(const Class& replacement,
                         IsolateReloadContext* context) const {
   ASSERT(IsolateReloadContext::IsSameClass(*this, replacement));
 
   // Class cannot change enum property.
   if (is_enum_class() != replacement.is_enum_class()) {
     context->AddReasonForCancelling(new (context->zone()) EnumClassConflict(
         context->zone(), *this, replacement));
     return;
   }
@@ skipping 206 matching lines @@
       const Array& data_array =
           Array::Handle(zone, CachedEmptyICDataArray(num_args));
       set_ic_data_array(data_array);
     }
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart.