Fix counting of scanned bytes in incremental marking step for large object.

test/cctest/test-heap.cc

 // Copyright 2012 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 3085 matching lines @@
   }
   // An entire block of handles has been filled.
   // Next handle would require a new block.
   ASSERT(data->next == data->limit);
 
   DeferredHandleScope deferred(isolate);
   DummyVisitor visitor;
   isolate->handle_scope_implementer()->Iterate(&visitor);
   deferred.Detach();
 }
+
+
+TEST(IncrementalMarkingStepMakesBigProgressWithLargeObjects) {
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
+  CompileRun("function f(n) {"
+             "    var a = new Array(n);"
+             "    for (var i = 0; i < n; i += 100) a[i] = i;"
+             "};"
+             "f(10 * 1024 * 1024);");
+  IncrementalMarking* marking = HEAP->incremental_marking();
+  if (marking->IsStopped()) marking->Start();
+  // This big step should be sufficient to mark the whole array.
+  marking->Step(100 * MB, IncrementalMarking::NO_GC_VIA_STACK_GUARD);
+  ASSERT(marking->IsComplete());
+}