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

test/cctest/compiler/test-multiple-return.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 <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/assembler.h"
 #include "src/base/bits.h"
@@ skipping 51 matching lines @@
       compiler::Operator::kNoProperties,  // properties
       kCalleeSaveRegisters,               // callee-saved registers
       kCalleeSaveFPRegisters,             // callee-saved fp regs
       CallDescriptor::kNoFlags,           // flags
       "c-call");
 }
 }  // namespace
 
 
 TEST(ReturnThreeValues) {
-  Zone zone;
+  base::AccountingAllocator allocator;
+  Zone zone(&allocator);
   CallDescriptor* desc = GetCallDescriptor(&zone, 3, 2);
   HandleAndZoneScope handles;
   RawMachineAssembler m(handles.main_isolate(),
                         new (handles.main_zone()) Graph(handles.main_zone()),
                         desc, MachineType::PointerRepresentation(),
                         InstructionSelector::SupportedMachineOperatorFlags());
 
   Node* p0 = m.Parameter(0);
   Node* p1 = m.Parameter(1);
   Node* add = m.Int32Add(p0, p1);
@@ skipping 26 matching lines @@
     OFStream os(stdout);
     code2->Disassemble("three_value_call", os);
   }
 #endif
   CHECK_EQ((123 + 456) + (123 - 456) + (123 * 456), mt.Call());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8