cmd/internal/obj/sparc64: fix ClassConst6 comment
cmd/internal/obj/sparc64: fix ClassConst6 comment

Change-Id: I57d41023bf938c77d8a53df90c655322d2882250

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