cmd/internal/obj/sparc64: add constants in preparation of System V compatible calling convention
cmd/internal/obj/sparc64: add constants in preparation of System V compatible calling convention

Change-Id: Ic7fcbbe68c044f39ba136f8c13377a2e6c47d327

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