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

test/cctest/wasm/wasm-run-utils.h

Index: test/cctest/wasm/wasm-run-utils.h
diff --git a/test/cctest/wasm/wasm-run-utils.h b/test/cctest/wasm/wasm-run-utils.h
index 53b7cb4ec8ce956e7442268e9bf671c1935d9485..a57c61eaf7f89b4c34b828b3cc44012b45ee55f4 100644
--- a/test/cctest/wasm/wasm-run-utils.h
+++ b/test/cctest/wasm/wasm-run-utils.h
@@ -221,7 +221,8 @@ inline void TestBuildingGraph(Zone* zone, JSGraph* jsgraph, ModuleEnv* module,
                               FunctionSig* sig, const byte* start,
                               const byte* end) {
   compiler::WasmGraphBuilder builder(zone, jsgraph, sig);
-  TreeResult result = BuildTFGraph(&builder, module, sig, start, end);
+  TreeResult result =
+      BuildTFGraph(zone->allocator(), &builder, module, sig, start, end);
   if (result.failed()) {
     ptrdiff_t pc = result.error_pc - result.start;
     ptrdiff_t pt = result.error_pt - result.start;
@@ -577,7 +578,7 @@ class WasmRunner {
   byte AllocateLocal(LocalType type) { return compiler_.AllocateLocal(type); }
 
  protected:
-  Zone zone;
+  ZoneForTesting zone;
   bool compiled_;
   LocalType storage_[WASM_RUNNER_MAX_NUM_PARAMETERS];
   FunctionSig signature_;