This was causing a test failure in TwoElseIfRewriting.

BUG=angle:716

Change-Id: I75e21ff586cdef10f0c35985a97fbb7c4783d2fe
Reviewed-on: https://chromium-review.googlesource.com/210991Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>