Remove wrong assert to fix a debug crash with arguments object.

src/contexts.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 144 matching lines @@
 
       // check parameter locals in context
       int param_index = scope_info->ParameterIndex(*name);
       if (param_index >= 0) {
         // slot found.
         int index = scope_info->ContextSlotIndex(
             isolate->heap()->arguments_shadow_symbol(), NULL);
         ASSERT(index >= 0);  // arguments must exist and be in the heap context
         Handle<JSObject> arguments(JSObject::cast(context->get(index)),
                                    isolate);
-        ASSERT(arguments->HasLocalProperty(isolate->heap()->length_symbol()));
         if (FLAG_trace_contexts) {
           PrintF("=> found parameter %d in arguments object\n", param_index);
         }
         *index_ = param_index;
         *attributes = NONE;
         return arguments;
       }
 
       // check intermediate context (holding only the function name variable)
       if (follow_context_chain) {
@@ skipping 163 matching lines @@
   // During bootstrapping we allow all objects to pass as global
   // objects. This is necessary to fix circular dependencies.
   Isolate* isolate = Isolate::Current();
   return isolate->heap()->gc_state() != Heap::NOT_IN_GC ||
       isolate->bootstrapper()->IsActive() ||
       object->IsGlobalObject();
 }
 #endif
 
 } }  // namespace v8::internal