cmd/internal/obj/sparc64: add Prog.mark flags
cmd/internal/obj/sparc64: add Prog.mark flags

Change-Id: Ia01457dc6e6dd189aec360a580e1f39d2faad9e5

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