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

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 694 matching lines @@
     }
     case kArchRet:
       AssembleReturn();
       break;
     case kArchStackPointer:
       __ movq(i.OutputRegister(), rsp);
       break;
     case kArchFramePointer:
       __ movq(i.OutputRegister(), rbp);
       break;
+    case kArchParentFramePointer:
+      if (frame_access_state()->frame()->needs_frame()) {
+        __ movq(i.OutputRegister(), Operand(rbp, 0));
+      } else {
+        __ movq(i.OutputRegister(), rbp);
+      }
+      break;
     case kArchTruncateDoubleToI: {
       auto result = i.OutputRegister();
       auto input = i.InputDoubleRegister(0);
       auto ool = new (zone()) OutOfLineTruncateDoubleToI(this, result, input);
       __ Cvttsd2siq(result, input);
       __ cmpq(result, Immediate(1));
       __ j(overflow, ool->entry());
       __ bind(ool->exit());
       break;
     }
@@ skipping 1437 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8