Add Smi::Zero and replace all Smi::FromInt(0) calls

src/transitions.cc

Index: src/transitions.cc
diff --git a/src/transitions.cc b/src/transitions.cc
index 082ebc16b015df44d1586fbaa355d6f6604ce65c..88c1549579d6d63ff31cd0eee70232ad11b158da 100644
--- a/src/transitions.cc
+++ b/src/transitions.cc
@@ -395,7 +395,7 @@ Handle<TransitionArray> TransitionArray::Allocate(Isolate* isolate,
                                                   int slack) {
   Handle<FixedArray> array = isolate->factory()->NewTransitionArray(
       LengthFor(number_of_transitions + slack));
-  array->set(kPrototypeTransitionsIndex, Smi::FromInt(0));
+  array->set(kPrototypeTransitionsIndex, Smi::kZero);
   array->set(kTransitionLengthIndex, Smi::FromInt(number_of_transitions));
   return Handle<TransitionArray>::cast(array);
 }