Make FastNewFunctionContextStub take slots parameter

src/code-stubs.h

 // Copyright 2012 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_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/code-stub-assembler.h"
@@ skipping 1042 matching lines @@
                                   compiler::Node* context);
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewClosure);
   DEFINE_TURBOFAN_CODE_STUB(FastNewClosure, TurboFanCodeStub);
 };
 
 class FastNewFunctionContextStub final : public TurboFanCodeStub {
  public:
   static const int kMaximumSlots = 64;
 
-  FastNewFunctionContextStub(Isolate* isolate, int slots)
-      : TurboFanCodeStub(isolate) {
-    DCHECK(slots >= 0 && slots <= kMaximumSlots);
-    minor_key_ = SlotsBits::encode(slots);
-  }
-
-  int slots() const { return SlotsBits::decode(minor_key_); }
+  explicit FastNewFunctionContextStub(Isolate* isolate)
+      : TurboFanCodeStub(isolate) {}
 
  private:
-  class SlotsBits : public BitField<int, 0, 8> {};
-
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewFunctionContext);
   DEFINE_TURBOFAN_CODE_STUB(FastNewFunctionContext, TurboFanCodeStub);
 };
 
 
 class FastNewObjectStub final : public PlatformCodeStub {
  public:
   explicit FastNewObjectStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewObject);
@@ skipping 2027 matching lines @@
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_