Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/test/mjsunit/es6/generators-objects.js b/test/mjsunit/es6/generators-objects.js
index 9390776..f304738 100644
--- a/test/mjsunit/es6/generators-objects.js
+++ b/test/mjsunit/es6/generators-objects.js
@@ -59,18 +59,12 @@
   assertEquals("[object Generator]", String(iter));
   assertEquals([], Object.getOwnPropertyNames(iter));
   assertTrue(iter !== g());
-
-  // g() is the same as new g().
-  iter = new g();
-  assertSame(g.prototype, Object.getPrototypeOf(iter));
-  assertTrue(iter instanceof g);
-  assertEquals("Generator", %_ClassOf(iter));
-  assertEquals("[object Generator]", String(iter));
   assertEquals("[object Generator]", Object.prototype.toString.call(iter));
   var gf = iter.__proto__.constructor;
   assertEquals("[object GeneratorFunction]", Object.prototype.toString.call(gf));
-  assertEquals([], Object.getOwnPropertyNames(iter));
-  assertTrue(iter !== new g());
+
+  // generators are not constructable.
+  assertThrows(()=>new g());
 }
 TestGeneratorObject();