Fixing bogus assertion.

src/incremental-marking.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 49 matching lines @@
 
 
 void IncrementalMarking::RecordWriteFromCode(HeapObject* obj,
                                              Object* value,
                                              Isolate* isolate) {
   ASSERT(obj->IsHeapObject());
 
   // Fast cases should already be covered by RecordWriteStub.
   ASSERT(value->IsHeapObject());
   ASSERT(!value->IsHeapNumber());
-  ASSERT(!value->IsString() || value->IsConsString());
+  ASSERT(!value->IsString() ||
+         value->IsConsString() ||
+         value->IsSlicedString());
   ASSERT(Marking::IsWhite(Marking::MarkBitFrom(HeapObject::cast(value))));
 
   IncrementalMarking* marking = isolate->heap()->incremental_marking();
   ASSERT(!marking->is_compacting_);
   marking->RecordWrite(obj, NULL, value);
 }
 
 
 void IncrementalMarking::RecordWriteForEvacuationFromCode(HeapObject* obj,
                                                           Object** slot,
@@ skipping 719 matching lines @@
   bytes_rescanned_ = 0;
   allocation_marking_factor_ = kInitialAllocationMarkingFactor;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSize();
 }
 
 } }  // namespace v8::internal