Revert of [modules] Basic support of exports

test/mjsunit/modules-exports1.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 var myvar = "VAR";
-assertEquals("VAR", myvar);
-assertEquals("VAR", eval("myvar"));
-(() => assertEquals("VAR", myvar))();
-
-export let mylet = "LET";
-assertEquals("LET", mylet);
-assertEquals("LET", eval("mylet"));
-(() => assertEquals("LET", mylet))();
-
-export const myconst = "CONST";
-assertEquals("CONST", myconst);
-assertEquals("CONST", eval("myconst"));
-(() => assertEquals("CONST", myconst))();
-
-
-myvar = 1;
-assertEquals(1, myvar);
-assertEquals(1, eval("myvar"));
-(() => assertEquals(1, myvar))();
-(() => myvar = 2)();
-assertEquals(2, myvar);
-(() => assertEquals(2, myvar))();
-{
-  let f = () => assertEquals(2, myvar);
-  f();
-}
-
-mylet = 1;
-assertEquals(1, mylet);
-assertEquals(1, eval("mylet"));
-(() => assertEquals(1, mylet))();
-(() => mylet = 2)();
-assertEquals(2, mylet);
-assertEquals(2, eval("mylet"));
-(() => assertEquals(2, mylet))();
-{
-  let f = () => assertEquals(2, mylet);
-  f();
-}
-
-assertThrows(() => myconst = 1, TypeError);
-assertEquals("CONST", myconst);
-assertEquals("CONST", eval("myconst"));
-(() => assertEquals("CONST", myconst))();
-{
-  let f = () => assertEquals("CONST", myconst);
-  f();
-}