This fixes a missing name check for keyed property loads targeting the
global object where the feedback was warmed up with a single name. This
affects {JSLoadProperty} nodes only, syntactic global property loads via
the {JSLoadGlobal} operator are not affected.

R=bmeurer@chromium.org
TEST=mjsunit/regress/regress-crbug-694416
BUG=chromium:694416

Change-Id: I54aa3f27eaa72630539f02602ec7642b04835b27
Reviewed-on: https://chromium-review.googlesource.com/445224Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43344}