[turbofan] Introduce LoadFunctionPrototype simplified operator.

src/compiler/simplified-operator.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_COMPILER_SIMPLIFIED_OPERATOR_H_
 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_
 
 #include <iosfwd>
 
 #include "src/base/compiler-specific.h"
@@ skipping 372 matching lines @@
 
   // store-element [base + index], value
   const Operator* StoreElement(ElementAccess const&);
 
   // load-typed-element buffer, [base + external + index]
   const Operator* LoadTypedElement(ExternalArrayType const&);
 
   // store-typed-element buffer, [base + external + index], value
   const Operator* StoreTypedElement(ExternalArrayType const&);
 
+  // load-function-prototype function
+  const Operator* LoadFunctionPrototype();
+
  private:
   Zone* zone() const { return zone_; }
 
   const SimplifiedOperatorGlobalCache& cache_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_H_