Expose a lower bound of malloc'd memory via heap statistics

src/type-cache.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_TYPE_CACHE_H_
 #define V8_TYPE_CACHE_H_
 
 #include "src/types.h"
 
 namespace v8 {
 namespace internal {
 
 class TypeCache final {
  private:
   // This has to be first for the initialization magic to work.
+  base::AccountingAllocator allocator;
   Zone zone_;
 
  public:
   static TypeCache const& Get();
 
-  TypeCache() = default;
+  TypeCache() : zone_(&allocator) {}
 
   Type* const kInt8 =
       CreateNative(CreateRange<int8_t>(), Type::UntaggedIntegral8());
   Type* const kUint8 =
       CreateNative(CreateRange<uint8_t>(), Type::UntaggedIntegral8());
   Type* const kUint8Clamped = kUint8;
   Type* const kInt16 =
       CreateNative(CreateRange<int16_t>(), Type::UntaggedIntegral16());
   Type* const kUint16 =
       CreateNative(CreateRange<uint16_t>(), Type::UntaggedIntegral16());
@@ skipping 109 matching lines @@
     return Type::Range(min, max, zone());
   }
 
   Zone* zone() { return &zone_; }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TYPE_CACHE_H_