Revert of [modules] Basic support of exports

test/mjsunit/modules-exports3.js

-// Copyright 2016 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.
-
-// MODULE
-
-export { myvar, mylet, myconst };
-
-var myvar = "VAR";
-assertEquals("VAR", myvar);
-let mylet = "LET";
-assertEquals("LET", mylet);
-const myconst = "CONST";
-assertEquals("CONST", myconst);
-
-function* gaga() { yield 1 }
-assertEquals(1, gaga().next().value);
-export {gaga};
-export default gaga;
-export {gaga as gigi};
-assertEquals(1, gaga().next().value);
-
-
-export let gugu = 42;
-
-{
-  assertEquals(42, gugu);
-}
-
-try {
-  assertEquals(42, gugu);
-} catch(_) {
-  assertUnreachable();
-}
-
-try {
-  throw {};
-} catch(_) {
-  assertEquals(42, gugu);
-}
-
-try {
-  throw {};
-} catch({x=gugu}) {
-  assertEquals(42, x);
-}
-
-assertEquals(5, eval("var x = 5; x"));