cmd/internal/obj/sparc64: remove if framesize <= obj.StackSmall case in stacksplit
cmd/internal/obj/sparc64: remove if framesize <= obj.StackSmall case in stacksplit

SPARC64 does not have small frames

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