Add convenience static members of Type: Smi and Mint.

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 11249)
+++ runtime/vm/object.cc	(working copy)
@@ -1914,11 +1914,6 @@
 }
 
 
-bool Class::IsObjectClass() const {
-  return id() == kInstanceCid;
-}
-
-
 bool Class::IsCanonicalSignatureClass() const {
   const Function& function = Function::Handle(signature_function());
   return (!function.IsNull() && (function.signature_class() == raw()));
@@ -2702,6 +2697,16 @@
 }
 
 
+RawType* Type::SmiType() {
+  return Isolate::Current()->object_store()->smi_type();
+}
+
+
+RawType* Type::MintType() {
+  return Isolate::Current()->object_store()->mint_type();
+}
+
+
 RawType* Type::DoubleInterface() {
   return Isolate::Current()->object_store()->double_interface();
 }