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/harmony/reflect-construct.js b/test/mjsunit/harmony/reflect-construct.js
index f2dfc15..c136957 100644
--- a/test/mjsunit/harmony/reflect-construct.js
+++ b/test/mjsunit/harmony/reflect-construct.js
@@ -279,10 +279,7 @@
 (function() {
   function* f() { yield 1; yield 2; }
   function* g() { yield 3; yield 4; }
-  var o = Reflect.construct(f, [], g);
-  assertEquals([1, 2], [...o]);
-  assertTrue(o.__proto__ === g.prototype);
-  assertTrue(o.__proto__ !== f.prototype);
+  assertThrows(()=>Reflect.construct(f, [], g));
 })();
 
 (function () {