Make FastNewFunctionContextStub take slots parameter

src/interface-descriptors.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include <memory>
 
 #include "src/assembler.h"
@@ skipping 455 matching lines @@
   }
 };
 
 class FastNewClosureDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(FastNewClosureDescriptor, CallInterfaceDescriptor)
 };
 
 class FastNewFunctionContextDescriptor : public CallInterfaceDescriptor {
  public:
-  DEFINE_PARAMETERS(kFunction)
-  DECLARE_DESCRIPTOR(FastNewFunctionContextDescriptor, CallInterfaceDescriptor)
+  DEFINE_PARAMETERS(kFunction, kSlots)
+  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(FastNewFunctionContextDescriptor,
+                                               CallInterfaceDescriptor)
+
+  static const Register FunctionRegister();
+  static const Register SlotsRegister();
 };
 
 class FastNewObjectDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(FastNewObjectDescriptor, CallInterfaceDescriptor)
 };
 
 class FastNewRestParameterDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(FastNewRestParameterDescriptor, CallInterfaceDescriptor)
@@ skipping 435 matching lines @@
 }  // namespace v8
 
 
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_