[wasm] Support a two-level namespace for imports.

test/cctest/wasm/test-run-wasm-js.cc

Index: test/cctest/wasm/test-run-wasm-js.cc
diff --git a/test/cctest/wasm/test-run-wasm-js.cc b/test/cctest/wasm/test-run-wasm-js.cc
index db524ca5d8fe655ec3813df8505178291d45b991..443a7832870f25bb1ab9b98d49d99c8daacc6461 100644
--- a/test/cctest/wasm/test-run-wasm-js.cc
+++ b/test/cctest/wasm/test-run-wasm-js.cc
@@ -57,7 +57,7 @@ uint32_t AddJsFunction(TestingModule* module, FunctionSig* sig,
   uint32_t index = static_cast<uint32_t>(module->module->functions.size() - 1);
   Isolate* isolate = CcTest::InitIsolateOnce();
   Handle<Code> code =
-      CompileWasmToJSWrapper(isolate, module, jsfunc, sig, "test");
+      CompileWasmToJSWrapper(isolate, module, jsfunc, sig, "test", nullptr);
   module->instance->function_code[index] = code;
   return index;
 }