Revert of Rework CallApi*Stubs.

src/x64/interface-descriptors-x64.cc

Index: src/x64/interface-descriptors-x64.cc
diff --git a/src/x64/interface-descriptors-x64.cc b/src/x64/interface-descriptors-x64.cc
index f724e5d48a112ebdf1e10f5be266087299de9e2e..333486ad8a4221329aecb92af9018a1ab16de40f 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -381,13 +381,27 @@
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-void ApiCallbackDescriptorBase::InitializePlatformSpecific(
+
+void ApiFunctionDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rdi,  // callee
       rbx,  // call_data
       rcx,  // holder
       rdx,  // api_function_address
+      rax,  // actual number of arguments
+  };
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
+void ApiAccessorDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      rdi,  // callee
+      rbx,  // call_data
+      rcx,  // holder
+      rdx,  // api_function_address
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }