Bug swiftshader:6

Change-Id: I3ab9023e2ac91a8435b403ebdd16e741197ecf6b
Reviewed-on: https://swiftshader-review.googlesource.com/7757Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/8138Reviewed-by: Alexis Hétu <sugoi@google.com>