Bug swiftshader:6

Change-Id: I1eaef2745f6e1aa3defb39f408df36e654f97b4d
Reviewed-on: https://swiftshader-review.googlesource.com/7956Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/8161Reviewed-by: Alexis Hétu <sugoi@google.com>