Bug swiftshader:6

Change-Id: I9ffcca588014466acb7f13a3df551a696ada8a91
Reviewed-on: https://swiftshader-review.googlesource.com/7755Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/8136Reviewed-by: Alexis Hétu <sugoi@google.com>