Optimize fixed-function states. Bug 18962347 Change-Id: I63dcba43c7c8383e5fcb5d2c817f1c2fb52f0e86 Reviewed-on: https://swiftshader-review.googlesource.com/1862 Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Nicolas Capens <capn@google.com>