Bug swiftshader:6

Change-Id: Ib60cdecf28027687271d2456c6aae79065fb9804
Reviewed-on: https://swiftshader-review.googlesource.com/7364Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>