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/cctest/test-weakmaps.cc b/test/cctest/test-weakmaps.cc
index 2630110..781ad1f 100644
--- a/test/cctest/test-weakmaps.cc
+++ b/test/cctest/test-weakmaps.cc
@@ -193,7 +193,7 @@
     HandleScope scope(isolate);
     for (int i = 0; i < 32; i++) {
       Handle<JSObject> object = factory->NewJSObject(function, TENURED);
-      CHECK(!heap->InNewSpace(object->address()));
+      CHECK(!heap->InNewSpace(*object));
       CHECK(!first_page->Contains(object->address()));
       int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
       JSWeakCollection::Set(weakmap, key, object, hash);
@@ -231,7 +231,7 @@
   Handle<JSObject> keys[32];
   for (int i = 0; i < 32; i++) {
     keys[i] = factory->NewJSObject(function, TENURED);
-    CHECK(!heap->InNewSpace(keys[i]->address()));
+    CHECK(!heap->InNewSpace(*keys[i]));
     CHECK(!first_page->Contains(keys[i]->address()));
   }
   Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate);