Revert of Do not eagerly instantiate accessors' JSFunction.

src/builtins.h

 // Copyright 2011 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_BUILTINS_H_
 #define V8_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 367 matching lines @@
 
   const char* name(int index) {
     DCHECK(index >= 0);
     DCHECK(index < builtin_count);
     return names_[index];
   }
 
   bool is_initialized() const { return initialized_; }
 
   MUST_USE_RESULT static MaybeHandle<Object> InvokeApiFunction(
-      Handle<HeapObject> function, Handle<Object> receiver, int argc,
+      Handle<JSFunction> function, Handle<Object> receiver, int argc,
       Handle<Object> args[]);
 
  private:
   Builtins();
 
   // The external C++ functions called from the code.
   static Address const c_functions_[cfunction_count];
 
   // Note: These are always Code objects, but to conform with
   // IterateBuiltins() above which assumes Object**'s for the callback
@@ skipping 203 matching lines @@
   friend class BuiltinFunctionTable;
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_H_