[Interpreter] Introduce IncStub and DecStub.

src/arm64/interface-descriptors-arm64.cc

Index: src/arm64/interface-descriptors-arm64.cc
diff --git a/src/arm64/interface-descriptors-arm64.cc b/src/arm64/interface-descriptors-arm64.cc
index 317f8c6be986375e2b68446901abcf5413060b4e..52741b6683b8c6e562781f838e3240075c28d6ef 100644
--- a/src/arm64/interface-descriptors-arm64.cc
+++ b/src/arm64/interface-descriptors-arm64.cc
@@ -347,6 +347,11 @@ void BinaryOpWithAllocationSiteDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void CountOpDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {x1};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
 
 void StringAddDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {