X87: Make FastNewFunctionContextStub take slots parameter.

src/x87/interface-descriptors-x87.cc

Index: src/x87/interface-descriptors-x87.cc
diff --git a/src/x87/interface-descriptors-x87.cc b/src/x87/interface-descriptors-x87.cc
index d962ef95c5a0bf8ce0ccb9804572df0814c0604c..c9883de4d2a033ed2d17de0faa21a237a1d1f89b 100644
--- a/src/x87/interface-descriptors-x87.cc
+++ b/src/x87/interface-descriptors-x87.cc
@@ -20,6 +20,11 @@ void CallInterfaceDescriptor::DefaultInitializePlatformSpecific(
                                    default_stub_registers);
 }
 
+const Register FastNewFunctionContextDescriptor::FunctionRegister() {
+  return edi;
+}
+const Register FastNewFunctionContextDescriptor::SlotsRegister() { return eax; }
+
 const Register LoadDescriptor::ReceiverRegister() { return edx; }
 const Register LoadDescriptor::NameRegister() { return ecx; }
 const Register LoadDescriptor::SlotRegister() { return eax; }
@@ -76,12 +81,6 @@ void FastNewClosureDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
 }
 
-void FastNewFunctionContextDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {edi};
-  data->InitializePlatformSpecific(arraysize(registers), registers, NULL);
-}
-
 void FastNewObjectDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {edi, edx};