[ESNext] Implement DynamicImportCall

test/mjsunit/es8/modules-import-5.js

Index: test/mjsunit/es8/modules-import-5.js
diff --git a/test/mjsunit/es8/modules-import-5.js b/test/mjsunit/es8/modules-import-5.js
new file mode 100644
index 0000000000000000000000000000000000000000..ea56f7b6b8dac2a4cf3389f8f9d98e9479ccbd6d
--- /dev/null
+++ b/test/mjsunit/es8/modules-import-5.js
@@ -0,0 +1,16 @@
+// 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';
+
+assertEquals(undefined, life);
+
+%RunMicrotasks();
+
+assertEquals(42, life);