Adding Smi support to Add, Sub, Mul, and Bitwise

src/type-info.cc

Index: src/type-info.cc
diff --git a/src/type-info.cc b/src/type-info.cc
index b905a747169ae3412f525ed848629215fb2bcf24..769df07e4fa20b97186ebbaeaa20e1aca4ef3ec5 100644
--- a/src/type-info.cc
+++ b/src/type-info.cc
@@ -709,8 +709,7 @@ void TypeFeedbackOracle::SetInfo(TypeFeedbackId ast_id, Object* target) {
 
 Representation Representation::FromType(TypeInfo info) {
   if (info.IsUninitialized()) return Representation::None();
-  // TODO(verwaest): Return Smi rather than Integer32.
-  if (info.IsSmi()) return Representation::Integer32();
+  if (info.IsSmi()) return Representation::Smi();
   if (info.IsInteger32()) return Representation::Integer32();
   if (info.IsDouble()) return Representation::Double();
   if (info.IsNumber()) return Representation::Double();