[ESNext] Implement DynamicImportCall

test/mjsunit/harmony/modules-import-15.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 x = await import('modules-skip-8.js');
+    %AbortJS('failure: should be unreachable');
+  } catch(e) {
+    assertEquals('Unexpected reserved word', e.message);
+    ran = true;
+  }
+}
+
+test();
+%RunMicrotasks();
+assertTrue(ran);
+
+var ran = false;
+
+async function test() {
+  try {
+    let x = await import('modules-skip-9.js');
+    %AbortJS('failure: should be unreachable');
+  } catch(e) {
+    assertTrue(e.message.startsWith('Error reading:'));
+    ran = true;
+  }
+}
+
+test();
+%RunMicrotasks();
+assertTrue(ran);