[modules] Extend a namespace test.

test/mjsunit/modules-namespace4.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
 
 import * as foo from "modules-namespace4.js";
 
 assertSame(undefined, a);
 assertThrows(() => b, ReferenceError);
+assertThrows(() => B, ReferenceError);
 assertThrows(() => c, ReferenceError);
 assertEquals(45, d());
 
 assertSame(undefined, foo.a);
 assertThrows(() => foo.b, ReferenceError);
+assertThrows(() => foo.B, ReferenceError);
 assertThrows(() => foo.c, ReferenceError);
 assertEquals(45, foo.d());
 assertThrows(() => foo.default, ReferenceError);
 assertSame(undefined, foo.doesnotexist);
 
+Function("Foo", " \
+    with (Foo) { \
+      assertEquals(undefined, a); \
+      assertThrows(() => b, ReferenceError); \
+      assertThrows(() => B, ReferenceError); \
+      assertThrows(() => c, ReferenceError); \
+      assertEquals(45, d()); \
+    }")(foo);
+
 export var a = 42;
 export let b = 43;
+export {b as B};
 export const c = 44;
 export function d() { return 45 };
 export default 46;
 
 assertEquals(42, a);
 assertEquals(43, b);
 assertEquals(44, c);
 assertEquals(45, d());
 
 assertEquals(42, foo.a);
 assertEquals(43, foo.b);
+assertEquals(43, foo.B);
 assertEquals(44, foo.c);
 assertEquals(45, foo.d());
 assertEquals(46, foo.default);
 assertSame(undefined, foo.doesnotexist);
+
+Function("Foo", " \
+    with (Foo) { \
+      assertEquals(42, a); \
+      assertEquals(43, b); \
+      assertEquals(43, B); \
+      assertEquals(44, c); \
+      assertEquals(45, d()); \
+    }")(foo);