We can iterate a scan on scavange page if it was precisely swept or just added to the old generatio…

src/store-buffer.cc

Index: src/store-buffer.cc
diff --git a/src/store-buffer.cc b/src/store-buffer.cc
index 0e4fd6429bce7b7a103b907b9eebcfd712b1bf96..a9e135647f689aecfbd9350d6b2afe5d592ee8b5 100644
--- a/src/store-buffer.cc
+++ b/src/store-buffer.cc
@@ -524,7 +524,7 @@ void StoreBuffer::IteratePointersToNewSpace(ObjectSlotCallback slot_callback,
           Page* page = reinterpret_cast<Page*>(chunk);
           ASSERT(page->owner() == heap_->map_space() ||
                  page->owner() == heap_->old_pointer_space());
-          CHECK(page->WasSweptPrecisely());
+          CHECK(!page->WasSweptConservatively());
 
           HeapObjectIterator iterator(page, NULL);
           for (HeapObject* heap_object = iterator.Next();