Bug swiftshader:86

Change-Id: If98cbf93e8b8d41246d9f06503da0752fe968ff8
Reviewed-on: https://swiftshader-review.googlesource.com/13448Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Corentin Wallez <cwallez@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>