[Turbofan] Fix IsSlot function in MoveOptimizer. LOG=N BUG=v8:4124

src/compiler/move-optimizer.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/move-optimizer.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 406 matching lines @@
   if (!gap_initialized) {
     CompressMoves(instr->parallel_moves()[0], instr->parallel_moves()[1]);
   }
   CompressBlock(block);
 }
 
 
 namespace {
 
 bool IsSlot(const InstructionOperand& op) {
-  return op.IsStackSlot() || op.IsDoubleStackSlot();
+  return op.IsStackSlot() || op.IsFPStackSlot();
 }
 
 
 bool LoadCompare(const MoveOperands* a, const MoveOperands* b) {
   if (!a->source().EqualsCanonicalized(b->source())) {
     return a->source().CompareCanonicalized(b->source());
   }
   if (IsSlot(a->destination()) && !IsSlot(b->destination())) return false;
   if (!IsSlot(a->destination()) && IsSlot(b->destination())) return true;
   return a->destination().CompareCanonicalized(b->destination());
@@ skipping 36 matching lines @@
         static_cast<Instruction::GapPosition>(1), code_zone());
     slot_1->AddMove(group_begin->destination(), load->destination());
     load->Eliminate();
   }
   loads.clear();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8