[turbofan] Unify referencing of stack slots

src/compiler/osr.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.h"
 #include "src/compiler/all-nodes.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/common-operator-reducer.h"
 #include "src/compiler/dead-code-elimination.h"
 #include "src/compiler/frame.h"
@@ skipping 310 matching lines @@
   NodeVector roots(tmp_zone);
   jsgraph->GetCachedNodes(&roots);
   trimmer.TrimGraph(roots.begin(), roots.end());
 }
 
 
 void OsrHelper::SetupFrame(Frame* frame) {
   // The optimized frame will subsume the unoptimized frame. Do so by reserving
   // the first spill slots.
   frame->ReserveSpillSlots(UnoptimizedFrameSlots());
-  // The frame needs to be adjusted by the number of unoptimized frame slots.
-  frame->SetOsrStackSlotCount(static_cast<int>(UnoptimizedFrameSlots()));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8