Add LSX optimations for loong64.

Change-Id: I9ff31b095d8e7b6bda6d76e4627800b2ef54ca84
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/877936
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>