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

test/cctest/compiler/test-jump-threading.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/instruction.h"
 #include "src/compiler/instruction-codes.h"
 #include "src/compiler/jump-threading.h"
 #include "test/cctest/cctest.h"
 
 namespace v8 {
@@ skipping 88 matching lines @@
   void AddGapMove(int index, const InstructionOperand& from,
                   const InstructionOperand& to) {
     sequence_.InstructionAt(index)
         ->GetOrCreateParallelMove(Instruction::START, main_zone())
         ->AddMove(from, to);
   }
 };
 
 
 void VerifyForwarding(TestCode& code, int count, int* expected) {
-  Zone local_zone;
+  base::AccountingAllocator allocator;
+  Zone local_zone(&allocator);
   ZoneVector<RpoNumber> result(&local_zone);
   JumpThreading::ComputeForwarding(&local_zone, result, &code.sequence_, true);
 
   CHECK(count == static_cast<int>(result.size()));
   for (int i = 0; i < count; i++) {
     CHECK(expected[i] == result[i].ToInt());
   }
 }
 
 
@@ skipping 639 matching lines @@
         for (int k = 4; k < 5; k++) assembly[k]--;
       }
       CheckAssemblyOrder(code, 5, assembly);
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8