BUG=swiftshader:86

Change-Id: Ia57c894170e790cdd1ea2fe3b92bbba7f643ba64
Reviewed-on: https://swiftshader-review.googlesource.com/13368Tested-by: Corentin Wallez <cwallez@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>