Bug swiftshader:17

Change-Id: I3ba076bdfd733797f627c50c37dea83326ddee35
Reviewed-on: https://swiftshader-review.googlesource.com/7714Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-on: https://swiftshader-review.googlesource.com/7670