This works around http://llvm.org/PR20013.

Change-Id: Ibbd8ab4678cf1caf39b329ea304bdbdc21075ddf
Reviewed-on: https://chromium-review.googlesource.com/206481Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: <ehsan@mozilla.com>