Due to how the traversers work, it might not be trivial to avoid the
info sink stack entirely, but minimize its use to keep the code as
functional as possible.

BUG=angleproject:958

Change-Id: I354313f10f496feea7c6a6f167b0617aeadbe5b0
Reviewed-on: https://chromium-review.googlesource.com/316412
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>