[turbofan] Add an operator to access the parent frame pointer

src/compiler/code-stub-assembler.cc

 // Copyright 2015 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.
 
 #include "src/compiler/code-stub-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 85 matching lines @@
 }
 
 void CodeStubAssembler::Bind(CodeStubAssembler::Label* label) {
   return label->Bind();
 }
 
 Node* CodeStubAssembler::LoadFramePointer() {
   return raw_assembler_->LoadFramePointer();
 }
 
+Node* CodeStubAssembler::LoadParentFramePointer() {
+  return raw_assembler_->LoadParentFramePointer();
+}
+
 Node* CodeStubAssembler::LoadStackPointer() {
   return raw_assembler_->LoadStackPointer();
 }
 
 Node* CodeStubAssembler::SmiShiftBitsConstant() {
   return Int32Constant(kSmiShiftSize + kSmiTagSize);
 }
 
 
 Node* CodeStubAssembler::SmiTag(Node* value) {
@@ skipping 486 matching lines @@
       }
     }
   }
 
   bound_ = true;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8