Make FastNewFunctionContextStub take slots parameter

src/interface-descriptors.cc

Index: src/interface-descriptors.cc
diff --git a/src/interface-descriptors.cc b/src/interface-descriptors.cc
index 7dc36aa2123344002f2f05c9e299f2a37d8699ba..d179a3aa4820f8702030532da28791baf28f859f 100644
--- a/src/interface-descriptors.cc
+++ b/src/interface-descriptors.cc
@@ -79,6 +79,23 @@ void VoidDescriptor::InitializePlatformSpecific(
   data->InitializePlatformSpecific(0, nullptr);
 }
 
+FunctionType*
+FastNewFunctionContextDescriptor::BuildCallInterfaceDescriptorFunctionType(
+    Isolate* isolate, int parameter_count) {
+  Zone* zone = isolate->interface_descriptor_zone();
+  FunctionType* function =
+      Type::Function(AnyTagged(zone), Type::Undefined(), 2, zone)->AsFunction();
+  function->InitParameter(0, AnyTagged(zone));
+  function->InitParameter(1, UntaggedIntegral32(zone));
+  return function;
+}
+
+void FastNewFunctionContextDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {FunctionRegister(), SlotsRegister()};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 FunctionType* LoadDescriptor::BuildCallInterfaceDescriptorFunctionType(
     Isolate* isolate, int parameter_count) {
   Zone* zone = isolate->interface_descriptor_zone();