cmd/internal/obj/sparc64: sort optab
cmd/internal/obj/sparc64: sort optab

Also remove the AXXX entry, it's an anachronism from the C world.

Change-Id: I5dc75c8a552facd8d69aee74e5b999d50ffb230e

4ad/go,4ad/go,4ad/go,4ad/go,4ad/go,4ad/go,4ad/go,4ad/go