[Interpreter] Introduce IncStub and DecStub.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index 7727767756781f270652601b35bf8964475bc7ac..cbe044e2ebea5f5a10d2662b6084450d1a43f7e8 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -276,6 +276,18 @@ Callable CodeFactory::BitwiseXor(Isolate* isolate) {
 }
 
 // static
+Callable CodeFactory::Inc(Isolate* isolate) {
+  IncStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+// static
+Callable CodeFactory::Dec(Isolate* isolate) {
+  DecStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+// static
 Callable CodeFactory::LessThan(Isolate* isolate) {
   LessThanStub stub(isolate);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());