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/symbols.js b/test/mjsunit/es6/symbols.js
index d502a83..3833857 100644
--- a/test/mjsunit/es6/symbols.js
+++ b/test/mjsunit/es6/symbols.js
@@ -441,8 +441,9 @@
 
 function TestWellKnown() {
   var symbols = [
+    "hasInstance",
     // TODO(rossberg): reactivate once implemented.
-    // "hasInstance", "isConcatSpreadable", "isRegExp",
+    // "isConcatSpreadable", "isRegExp",
     "iterator", /* "toStringTag", */ "unscopables"
   ]