Added missing canonicalization of typedef signature instantiated during

runtime/vm/class_finalizer.cc

Index: runtime/vm/class_finalizer.cc
diff --git a/runtime/vm/class_finalizer.cc b/runtime/vm/class_finalizer.cc
index ab89f7fcdbd7ae52aa732ad7d0aa92005c395326..e371b2e385a3bd66cb9b997562f021e0f755593c 100644
--- a/runtime/vm/class_finalizer.cc
+++ b/runtime/vm/class_finalizer.cc
@@ -1249,6 +1249,7 @@ RawAbstractType* ClassFinalizer::FinalizeType(const Class& cls,
           // Note that if type_args contains type parameters, signature is still
           // uninstantiated here (typedef type parameters were substituted in
           // the signature with typedef type arguments).
+          FinalizeSignature(scope_class, signature);  // Canonicalize signature.
         }
         fun_type.set_signature(signature);
       } else {