When SSE4.1 isn't available, we were infinitely calling PackUnsigned() recursively. Bug b/37496082 Change-Id: Ie1fa8150d64740776c5b80baf07d997dde9d51be Reviewed-on: https://swiftshader-review.googlesource.com/12929Tested-by: Nicolas Capens <nicolascapens@google.com> Reviewed-by: Casey Dahlin <sadmac@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com>
