Add checks to the marking queue

src/heap/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 637 matching lines @@
     HeapObject* obj = marking_deque->Pop();
 
     // Explicitly skip one word fillers. Incremental markbit patterns are
     // correct only for objects that occupy at least two words.
     Map* map = obj->map();
     if (map == filler_map) continue;
 
     int size = obj->SizeFromMap(map);
     unscanned_bytes_of_large_object_ = 0;
     VisitObject(map, obj, size);
-    int delta = (size - unscanned_bytes_of_large_object_);
-    // TODO(jochen): remove after http://crbug.com/381820 is resolved.
-    CHECK_LT(0, delta);
-    bytes_processed += delta;
+    bytes_processed += size - unscanned_bytes_of_large_object_;
   }
   return bytes_processed;
 }
 
 
 void IncrementalMarking::ProcessMarkingDeque() {
   Map* filler_map = heap_->one_pointer_filler_map();
   MarkingDeque* marking_deque =
       heap_->mark_compact_collector()->marking_deque();
   while (!marking_deque->IsEmpty()) {
@@ skipping 312 matching lines @@
 void IncrementalMarking::IncrementIdleMarkingDelayCounter() {
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 }
 }  // namespace v8::internal