Fix invalid assertion.

src/runtime.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 1214 matching lines @@
   ASSERT(args.length() == 4);
 
   CONVERT_ARG_CHECKED(Context, context, 0);
   Handle<String> name(String::cast(args[1]));
   PropertyAttributes mode = static_cast<PropertyAttributes>(args.smi_at(2));
   RUNTIME_ASSERT(mode == READ_ONLY || mode == NONE);
   Handle<Object> initial_value(args[3], isolate);
 
   // Declarations are always done in the function context.
   context = Handle<Context>(context->fcontext());
-  ASSERT(context->IsFunctionContext());
+  ASSERT(context->IsFunctionContext() || context->IsGlobalContext());
 
   int index;
   PropertyAttributes attributes;
   ContextLookupFlags flags = DONT_FOLLOW_CHAINS;
   Handle<Object> holder =
       context->Lookup(name, flags, &index, &attributes);
 
   if (attributes != ABSENT) {
     // The name was declared before; check for conflicting
     // re-declarations: This is similar to the code in parser.cc in
@@ skipping 11095 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal