cmd/internal/sparc64: fix prolog/epilog generation for leaves
cmd/internal/sparc64: fix prolog/epilog generation for leaves

Change-Id: I09a5bd54d0f8532a2e6066a08c524b745526ed31

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