[turbofan] split compilation stats off from HStatistics and track high water marks

src/compiler/zone-pool.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/zone-pool.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 ZonePool::StatsScope::StatsScope(ZonePool* zone_pool)
-    : zone_pool_(zone_pool), max_allocated_bytes_(0) {
+    : zone_pool_(zone_pool),
+      total_allocated_bytes_at_start_(zone_pool->GetTotalAllocatedBytes()),
+      max_allocated_bytes_(0) {
   zone_pool_->stats_.push_back(this);
   for (auto zone : zone_pool_->used_) {
     size_t size = static_cast<size_t>(zone->allocation_size());
     std::pair<InitialValues::iterator, bool> res =
         initial_values_.insert(std::make_pair(zone, size));
     USE(res);
     DCHECK(res.second);
   }
 }
 
@@ skipping 16 matching lines @@
     // Adjust for initial values.
     InitialValues::iterator it = initial_values_.find(zone);
     if (it != initial_values_.end()) {
       total -= it->second;
     }
   }
   return total;
 }
 
 
+size_t ZonePool::StatsScope::GetTotalAllocatedBytes() {
+  return zone_pool_->GetTotalAllocatedBytes() - total_allocated_bytes_at_start_;
+}
+
+
 void ZonePool::StatsScope::ZoneReturned(Zone* zone) {
   size_t current_total = GetCurrentAllocatedBytes();
   // Update max.
   max_allocated_bytes_ = std::max(max_allocated_bytes_, current_total);
   // Drop zone from initial value map.
   InitialValues::iterator it = initial_values_.find(zone);
   if (it != initial_values_.end()) {
     initial_values_.erase(it);
   }
 }
@@ skipping 65 matching lines @@
   } else {
     zone->DeleteAll();
     DCHECK_EQ(0, zone->allocation_size());
     unused_.push_back(zone);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8