Bug swiftshader:6

Change-Id: I170feba4050b750727fa57927545996577123e30
Reviewed-on: https://swiftshader-review.googlesource.com/7930Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/8155Reviewed-by: Alexis Hétu <sugoi@google.com>