Fix typo in r25689 (Refactor Map::ConstructionCount.)

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 2b15eb4b9b8495bec4210b559a4d4f09b326adbd..c6f8b10a9e4563f4896a4fa227aa498a28e00af1 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5677,7 +5677,7 @@ class Map: public HeapObject {
   // This counter is used for in-object slack tracking and for map aging.
   // The in-object slack tracking is considered enabled when the counter is
   // in the range [kSlackTrackingCounterStart, kSlackTrackingCounterEnd].
-  class Counter : public BitField<bool, 28, 4> {};
+  class Counter : public BitField<int, 28, 4> {};
   static const int kSlackTrackingCounterStart = 14;
   static const int kSlackTrackingCounterEnd = 8;
   static const int kRetainingCounterStart = kSlackTrackingCounterEnd - 1;