[Interpreter] Introduce IncStub and DecStub.

src/s390/interface-descriptors-s390.cc

Index: src/s390/interface-descriptors-s390.cc
diff --git a/src/s390/interface-descriptors-s390.cc b/src/s390/interface-descriptors-s390.cc
index 843a4e28fabef220dbb6a2c4e5447703bbdd3326..1194cb608c2b8abfdbe912e9611190fb41d8d266 100644
--- a/src/s390/interface-descriptors-s390.cc
+++ b/src/s390/interface-descriptors-s390.cc
@@ -276,6 +276,12 @@ void BinaryOpWithAllocationSiteDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void CountOpDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {r4};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 void StringAddDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r3, r2};