[ESNext] Implement DynamicImportCall

test/mjsunit/harmony/modules-import-6.js

+// 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 --harmony-dynamic-import
+
+var ran = false;
+
+async function test() {
+  try {
+    let [namespace1, namespace2] = await Promise.all([
+      import('modules-skip-1.js'),
+      import('modules-skip-3.js')
+    ]);
+
+    let life = namespace1.life();
+    let stringlife = namespace2.stringlife;
+    assertEquals(42, life);
+    assertEquals("42", stringlife);
+    ran = true;
+  } catch(e) {
+    %AbortJS("failure: " + e);
+  }
+}
+
+test();
+
+%RunMicrotasks();
+assertTrue(ran);