Bug swiftshader:27

Change-Id: I11238decf114381126a7465c462d918a3f16b0d8
Reviewed-on: https://swiftshader-review.googlesource.com/8273Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>