[modules] Never do lazy parsing in modules.

test/mjsunit/modules-preparse.js

Index: test/mjsunit/modules-preparse.js
diff --git a/test/mjsunit/regress/regress-crbug-648740.js b/test/mjsunit/modules-preparse.js
similarity index 65%
copy from test/mjsunit/regress/regress-crbug-648740.js
copy to test/mjsunit/modules-preparse.js
index e52d899852433bbe95bcc3c1de54a56b5c738d7f..6006ab23063fc57f68f67183d489ce7fd344de91 100644
--- a/test/mjsunit/regress/regress-crbug-648740.js
+++ b/test/mjsunit/modules-preparse.js
@@ -1,11 +1,12 @@
 // 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
 // Flags: --min-preparse-length=0
 
-(function () {
-  function foo() {
-    const arguments = 42;
-  }
-})()
+let foo = 42;
+function testFoo(x) { assertEquals(x, foo); }
+testFoo(42);
+foo++;
+testFoo(43);