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

src/compiler/pipeline-statistics.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 <memory>
 
 #include "src/compilation-info.h"
 #include "src/compiler/pipeline-statistics.h"
-#include "src/compiler/zone-stats.h"
+#include "src/compiler/zone-pool.h"
 #include "src/isolate.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 void PipelineStatistics::CommonStats::Begin(
     PipelineStatistics* pipeline_stats) {
   DCHECK(!scope_);
-  scope_.reset(new ZoneStats::StatsScope(pipeline_stats->zone_stats_));
+  scope_.reset(new ZonePool::StatsScope(pipeline_stats->zone_pool_));
   timer_.Start();
   outer_zone_initial_size_ = pipeline_stats->OuterZoneSize();
   allocated_bytes_at_start_ =
       outer_zone_initial_size_ -
       pipeline_stats->total_stats_.outer_zone_initial_size_ +
-      pipeline_stats->zone_stats_->GetCurrentAllocatedBytes();
+      pipeline_stats->zone_pool_->GetCurrentAllocatedBytes();
 }
 
 
 void PipelineStatistics::CommonStats::End(
     PipelineStatistics* pipeline_stats,
     CompilationStatistics::BasicStats* diff) {
   DCHECK(scope_);
   diff->function_name_ = pipeline_stats->function_name_;
   diff->delta_ = timer_.Elapsed();
   size_t outer_zone_diff =
       pipeline_stats->OuterZoneSize() - outer_zone_initial_size_;
   diff->max_allocated_bytes_ = outer_zone_diff + scope_->GetMaxAllocatedBytes();
   diff->absolute_max_allocated_bytes_ =
       diff->max_allocated_bytes_ + allocated_bytes_at_start_;
   diff->total_allocated_bytes_ =
       outer_zone_diff + scope_->GetTotalAllocatedBytes();
   scope_.reset();
   timer_.Stop();
 }
 
+
 PipelineStatistics::PipelineStatistics(CompilationInfo* info,
-                                       ZoneStats* zone_stats)
+                                       ZonePool* zone_pool)
     : isolate_(info->isolate()),
       outer_zone_(info->zone()),
-      zone_stats_(zone_stats),
+      zone_pool_(zone_pool),
       compilation_stats_(isolate_->GetTurboStatistics()),
       source_size_(0),
       phase_kind_name_(nullptr),
       phase_name_(nullptr) {
   if (info->has_shared_info()) {
     source_size_ = static_cast<size_t>(info->shared_info()->SourceSize());
     std::unique_ptr<char[]> name =
         info->shared_info()->DebugName()->ToCString();
     function_name_ = name.get();
   }
@@ skipping 35 matching lines @@
 void PipelineStatistics::EndPhase() {
   DCHECK(InPhaseKind());
   CompilationStatistics::BasicStats diff;
   phase_stats_.End(this, &diff);
   compilation_stats_->RecordPhaseStats(phase_kind_name_, phase_name_, diff);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8