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

src/compiler/simplified-lowering.cc

 // 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.
 
 #include "src/compiler/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 1391 matching lines @@
         return VisitFloat64Cmp(node);
       case IrOpcode::kFloat64ExtractLowWord32:
       case IrOpcode::kFloat64ExtractHighWord32:
         return VisitUnop(node, UseInfo::Float64(), NodeOutputInfo::Int32());
       case IrOpcode::kFloat64InsertLowWord32:
       case IrOpcode::kFloat64InsertHighWord32:
         return VisitBinop(node, UseInfo::Float64(), UseInfo::TruncatingWord32(),
                           NodeOutputInfo::Float64());
       case IrOpcode::kLoadStackPointer:
       case IrOpcode::kLoadFramePointer:
+      case IrOpcode::kLoadParentFramePointer:
         return VisitLeaf(node, NodeOutputInfo::Pointer());
       case IrOpcode::kStateValues:
         VisitStateValues(node);
         break;
       default:
         VisitInputs(node);
         // Assume the output is tagged.
         SetOutput(node, NodeOutputInfo::AnyTagged());
         break;
     }
@@ skipping 558 matching lines @@
   ReplaceEffectUses(node, comparison);
   node->ReplaceInput(0, comparison);
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
   node->TrimInputCount(2);
   NodeProperties::ChangeOp(node, machine()->IntLessThanOrEqual());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8