This should give the highest possible scores. Note that immediate is
not always available.

Bug: angleproject:3163
Change-Id: Ifedabd39819625b57feda71ed83a7bee8fa0a42b
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1638904
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>