[turbofan]: Elide extra move when accessing stack or frame register

src/compiler/instruction.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/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/schedule.h"
 
 namespace v8 {
@@ skipping 77 matching lines @@
           break;
         case kRepTagged:
           os << "|t";
           break;
         default:
           os << "|?";
           break;
       }
       return os << "]";
     }
+    case InstructionOperand::STACK_POINTER:
+      return os << "[stack_pointer]";
+    case InstructionOperand::FRAME_POINTER:
+      return os << "[frame_pointer]";
     case InstructionOperand::INVALID:
       return os << "(x)";
   }
   UNREACHABLE();
   return os;
 }
 
 
 std::ostream& operator<<(std::ostream& os,
                          const PrintableMoveOperands& printable) {
@@ skipping 700 matching lines @@
       os << " B" << succ.ToInt();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8