fix variable shadowing

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 186 matching lines @@
     // Will compress after insertion.
     gap_initialized = false;
     std::swap(instr->parallel_moves()[0], instr->parallel_moves()[1]);
   }
   auto move = instr->GetOrCreateParallelMove(
       static_cast<Instruction::GapPosition>(0), code_zone());
   // Delete relevant entries in predecessors and move everything to block.
   bool first_iteration = true;
   for (auto pred_index : block->predecessors()) {
     auto pred = code()->InstructionBlockAt(pred_index);
-    auto instr = LastInstruction(pred);
-    auto move_ops = instr->parallel_moves()[0]->move_operands();
+    auto move_ops = LastInstruction(pred)->parallel_moves()[0]->move_operands();
     for (auto op = move_ops->begin(); op != move_ops->end(); ++op) {
       if (op->IsRedundant()) continue;
       MoveKey key = {*op->source(), *op->destination()};
       auto it = move_map.find(key);
       USE(it);
       DCHECK(it != move_map.end());
       if (first_iteration) {
         move->AddMove(op->source(), op->destination(), code_zone());
       }
       op->Eliminate();
@@ skipping 70 matching lines @@
     std::swap(*new_move, *it);
     ++it;
   }
   DCHECK_EQ(it, slot_1->move_operands()->end());
   new_moves.clear();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8