binary

This bug is introduced when we implement image texture robust
initialization, where we forgot to update active image units mask in program
cache.

Bug: angleproject:2766
Change-Id: I01de02803173f2cf5b7b9ff740175a4d7cbee4ba
Reviewed-on: https://chromium-review.googlesource.com/1198683Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jiajia Qin <jiajia.qin@intel.com>