Commit bfe1e7737a changed how texture swizzles are set up.
This exposed a latent bug in the VMware driver: we were ignoring
the texture instruction's writemask when applying the 0 and 1
swizzle terms.
This wasn't caught by the Piglit texture swizzle test because it
only exercises fixed function (no write masking).
Fixes issues seen with ETQW apitrace.
CC: <mesa-stable@lists.freedesktop.org>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>
f7e78abdf4