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

test/cctest/test-run-wasm-relocation-x87.cc

Index: test/cctest/test-run-wasm-relocation-x87.cc
diff --git a/test/cctest/test-run-wasm-relocation-x87.cc b/test/cctest/test-run-wasm-relocation-x87.cc
index d74a10761d04e38c5ceacff1c25a83dbb09728da..6cbd065c1b9bcdbb3578bfef78bca66a84667baa 100644
--- a/test/cctest/test-run-wasm-relocation-x87.cc
+++ b/test/cctest/test-run-wasm-relocation-x87.cc
@@ -25,8 +25,8 @@ 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);