Make FastNewFunctionContextStub take slots parameter

src/arm/interface-descriptors-arm.cc

Index: src/arm/interface-descriptors-arm.cc
diff --git a/src/arm/interface-descriptors-arm.cc b/src/arm/interface-descriptors-arm.cc
index da979c45d9d95695cb10a6259a19060d52d606ba..172d0fcb5b7d3bb713bf72f8b423a79a45246c8e 100644
--- a/src/arm/interface-descriptors-arm.cc
+++ b/src/arm/interface-descriptors-arm.cc
@@ -22,6 +22,11 @@ void CallInterfaceDescriptor::DefaultInitializePlatformSpecific(
                                    default_stub_registers);
 }
 
+const Register FastNewFunctionContextDescriptor::FunctionRegister() {
+  return r1;
+}
+const Register FastNewFunctionContextDescriptor::SlotsRegister() { return r0; }
+
 const Register LoadDescriptor::ReceiverRegister() { return r1; }
 const Register LoadDescriptor::NameRegister() { return r2; }
 const Register LoadDescriptor::SlotRegister() { return r0; }
@@ -73,12 +78,6 @@ void FastNewClosureDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-void FastNewFunctionContextDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {r1};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
 void FastNewObjectDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r1, r3};