[ESNext] Implement DynamicImportCall

test/mjsunit/harmony/modules-import-5.js

Index: test/mjsunit/harmony/modules-import-5.js
diff --git a/test/mjsunit/harmony/modules-import-5.js b/test/mjsunit/harmony/modules-import-5.js
new file mode 100644
index 0000000000000000000000000000000000000000..d9237828fed87055148092b5b588503af2e50596
--- /dev/null
+++ b/test/mjsunit/harmony/modules-import-5.js
@@ -0,0 +1,13 @@
+// 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 life;
+let x = 'modules-skip-1.js';
+import(x).then(namespace => life = namespace.life());
+x = 'modules-skip-2.js';

[adamk, 2017/03/16 21:41:23]

I'm not sure I get this test...how could it fail?

[gsathya, 2017/03/17 00:47:22]

This makes sure we do GetValue(argRef) synchronously. A lot of transpilers fail
this because they do 

import = x => Promise.resolve().then(() => require(x));

I can remove this if you don't think it's worthwhile

+
+%RunMicrotasks();
+assertEquals(42, life);