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

test/cctest/test-run-wasm-relocation-ia32.cc

 // Copyright 2015 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 <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/debug/debug.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/ia32/frames-ia32.h"
 #include "src/ic/ic.h"
 #include "src/macro-assembler.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/c-signature.h"
 #include "test/cctest/compiler/call-tester.h"
 
 using namespace v8::internal;
 using namespace v8::internal::compiler;
 
 #define __ assm.
 
 static int32_t DummyStaticFunction(Object* result) { return 1; }
 
 TEST(WasmRelocationIa32) {
   CcTest::InitializeVM();
-  Zone zone;
   Isolate* isolate = CcTest::i_isolate();
+  Zone zone(isolate->allocator());
   HandleScope scope(isolate);
   v8::internal::byte buffer[4096];
   Assembler assm(isolate, buffer, sizeof buffer);
   DummyStaticFunction(NULL);
   int32_t imm = 1234567;
 
   __ mov(eax, Immediate(reinterpret_cast<Address>(imm),
                         RelocInfo::WASM_MEMORY_REFERENCE));
   __ nop();
   __ ret(0);
@@ skipping 40 matching lines @@
 #ifdef OBJECT_PRINT
   // OFStream os(stdout);
   code->Print(os);
   begin = code->instruction_start();
   end = begin + code->instruction_size();
   disasm::Disassembler::Disassemble(stdout, begin, end);
 #endif
 }
 
 #undef __