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

src/runtime/runtime-collections.cc

Index: src/runtime/runtime-collections.cc
diff --git a/src/runtime/runtime-collections.cc b/src/runtime/runtime-collections.cc
index 57e5d98532e681a1fc79829f9925ea61ce04cf93..b25a5ef5c2f5a531bae09267200621b49a2638da 100644
--- a/src/runtime/runtime-collections.cc
+++ b/src/runtime/runtime-collections.cc
@@ -95,7 +95,7 @@ RUNTIME_FUNCTION(Runtime_SetIteratorInitialize) {
         kind == JSSetIterator::kKindEntries);
   Handle<OrderedHashSet> table(OrderedHashSet::cast(set->table()));
   holder->set_table(*table);
-  holder->set_index(Smi::kZero);
+  holder->set_index(Smi::FromInt(0));
   holder->set_kind(Smi::FromInt(kind));
   return isolate->heap()->undefined_value();
 }
@@ -191,7 +191,7 @@ RUNTIME_FUNCTION(Runtime_MapIteratorInitialize) {
         kind == JSMapIterator::kKindEntries);
   Handle<OrderedHashMap> table(OrderedHashMap::cast(map->table()));
   holder->set_table(*table);
-  holder->set_index(Smi::kZero);
+  holder->set_index(Smi::FromInt(0));
   holder->set_kind(Smi::FromInt(kind));
   return isolate->heap()->undefined_value();
 }