[wasm] instantiate expressed in terms of compile

test/mjsunit/wasm/wasm-api-overloading.js

Index: test/mjsunit/wasm/wasm-api-overloading.js
diff --git a/test/mjsunit/wasm/wasm-api-overloading.js b/test/mjsunit/wasm/wasm-api-overloading.js
new file mode 100644
index 0000000000000000000000000000000000000000..196b13b078f1d90a1a90324c741880643e6f14af
--- /dev/null
+++ b/test/mjsunit/wasm/wasm-api-overloading.js
@@ -0,0 +1,37 @@
+// Copyright 2017 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.
+
+// Flags: --allow-natives-syntax
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+let buffer = (() => {
+  let builder = new WasmModuleBuilder();
+  builder.addFunction("f", kSig_i_v)
+    .addBody([kExprI32Const, 42])
+    .exportAs("f");
+  return builder.toBuffer();
+})();
+
+var module = new WebAssembly.Module(buffer);
+var wrapper = Promise.resolve(module);
+
+assertPromiseResult(
+  WebAssembly.instantiate(wrapper),
+  assertUnreachable,
+  e => assertTrue(e instanceof TypeError));
+
+assertPromiseResult((
+  () => {
+    var old = %SetWasmCompileFromPromiseOverload();
+    var ret = WebAssembly.instantiate(wrapper);
+    %ResetWasmOverloads(old);
+    return ret;
+  })(),
+  pair => {
+    assertTrue(pair.instance instanceof WebAssembly.Instance);
+    assertTrue(pair.module instanceof WebAssembly.Module)
+  },
+  assertUnreachable);