[wasm] add WebAssembly.instantiate

test/mjsunit/wasm/instantiate-module-basic.js

 // 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.
 
 // Flags: --expose-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 let kReturnValue = 17;
@@ skipping 39 matching lines @@
   let main = instance.exports.main;
   assertFalse(main === undefined);
   assertFalse(main === null);
   assertFalse(main === 0);
   assertEquals("function", typeof main);
 
   assertEquals(kReturnValue, main());
 }
 
 // Official API
-let module = new WebAssembly.Module(buffer);
-CheckInstance(new WebAssembly.Instance(module));
+(function BasicJSAPITest() {
+  print("sync module compile...");
+  let module = new WebAssembly.Module(buffer);
+  print("sync module instantiate...");
+  CheckInstance(new WebAssembly.Instance(module));
 
-let promise = WebAssembly.compile(buffer);
-promise.then(module => CheckInstance(new WebAssembly.Instance(module)));
+  print("async module compile...");
+  let promise = WebAssembly.compile(buffer);
+  promise.then(module => CheckInstance(new WebAssembly.Instance(module)));
+
+  print("async instantiate...");
+  let instance_promise = WebAssembly.instantiate(buffer);
+  instance_promise.then(CheckInstance);
+})();
 
 // Check that validate works correctly for a module.
 assertTrue(WebAssembly.validate(buffer));
 assertFalse(WebAssembly.validate(bytes(88, 88, 88, 88, 88, 88, 88, 88)));
 
 // Negative tests.
 (function InvalidModules() {
   print("InvalidModules...");
   let invalid_cases = [undefined, 1, "", "a", {some:1, obj: "b"}];
   let len = invalid_cases.length;
@@ skipping 144 matching lines @@
   assertEquals(1, i1.exports.f());
   assertEquals(1000, i2.exports.f());
 })();
 
 (function MustBeMemory() {
   print("MustBeMemory...");
   var memory = new ArrayBuffer(65536);
   var module = new WebAssembly.Module(buffer);
   assertThrows(() => new WebAssembly.Instance(module, null, memory), TypeError);
 })();