Merged changes to avoid OOM for large wasm modules.

src/compiler/zone-stats.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_STATS_H_
 #define V8_COMPILER_ZONE_STATS_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 48 matching lines @@
     InitialValues initial_values_;
     size_t total_allocated_bytes_at_start_;
     size_t max_allocated_bytes_;
 
     DISALLOW_COPY_AND_ASSIGN(StatsScope);
   };
 
   explicit ZoneStats(AccountingAllocator* allocator);
   ~ZoneStats();
 
-  size_t GetMaxAllocatedBytes();
-  size_t GetTotalAllocatedBytes();
-  size_t GetCurrentAllocatedBytes();
+  size_t GetMaxAllocatedBytes() const;
+  size_t GetTotalAllocatedBytes() const;
+  size_t GetCurrentAllocatedBytes() const;
 
  private:
   Zone* NewEmptyZone(const char* zone_name);
   void ReturnZone(Zone* zone);
 
   static const size_t kMaxUnusedSize = 3;
   typedef std::vector<Zone*> Zones;
   typedef std::vector<StatsScope*> Stats;
 
   Zones zones_;
   Stats stats_;
   size_t max_allocated_bytes_;
   size_t total_deleted_bytes_;
   AccountingAllocator* allocator_;
 
   DISALLOW_COPY_AND_ASSIGN(ZoneStats);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ZONE_STATS_H_