cmd/internal/obj/sparc64: fix generation of 64-bit constants
cmd/internal/obj/sparc64: fix generation of 64-bit constants

Change-Id: Iab6110e38e758161b355b3c137a52a18a81c6ed0

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