Revert of Replaced different means of zone pooling/reusing by one zone segment pool

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 299 matching lines @@
     const Instruction* last_instr =
         code()->instructions()[pred->last_instruction_index()];
     if (last_instr->IsCall()) return;
     if (last_instr->TempCount() != 0) return;
     if (last_instr->OutputCount() != 0) return;
     for (size_t i = 0; i < last_instr->InputCount(); ++i) {
       const InstructionOperand* op = last_instr->InputAt(i);
       if (!op->IsConstant() && !op->IsImmediate()) return;
     }
   }
-  // TODO(dcarney): pass a ZoneStats down for this?
+  // TODO(dcarney): pass a ZonePool down for this?
   MoveMap move_map(local_zone());
   size_t correct_counts = 0;
   // Accumulate set of shared moves.
   for (RpoNumber& pred_index : block->predecessors()) {
     const InstructionBlock* pred = code()->InstructionBlockAt(pred_index);
     const Instruction* instr = LastInstruction(pred);
     if (instr->parallel_moves()[0] == nullptr ||
         instr->parallel_moves()[0]->empty()) {
       return;
     }
@@ skipping 143 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