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

src/compiler/zone-pool.h

 // 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.
 
 #ifndef V8_COMPILER_ZONE_POOL_H_
 #define V8_COMPILER_ZONE_POOL_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 26 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(Scope);
   };
 
   class StatsScope FINAL {
    public:
     explicit StatsScope(ZonePool* zone_pool);
     ~StatsScope();
 
     size_t GetMaxAllocatedBytes();
     size_t GetCurrentAllocatedBytes();
+    size_t GetTotalAllocatedBytes();
 
    private:
     friend class ZonePool;
     void ZoneReturned(Zone* zone);
 
     typedef std::map<Zone*, size_t> InitialValues;
 
     ZonePool* const zone_pool_;
     InitialValues initial_values_;
+    size_t total_allocated_bytes_at_start_;
     size_t max_allocated_bytes_;
 
     DISALLOW_COPY_AND_ASSIGN(StatsScope);
   };
 
   explicit ZonePool(Isolate* isolate);
   ~ZonePool();
 
   size_t GetMaxAllocatedBytes();
   size_t GetTotalAllocatedBytes();
@@ skipping 16 matching lines @@
   size_t total_deleted_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(ZonePool);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif