Bug swiftshader:13

Change-Id: I5dd2ce4ddf1eaf0ec2fc732d022ccad2331e6b6b
Reviewed-on: https://swiftshader-review.googlesource.com/8070Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/8230Reviewed-by: Alexis Hétu <sugoi@google.com>