cmd/internal/obj: fix arm64 and sparc64 register space ranges
cmd/internal/obj: fix arm64 and sparc64 register space ranges

Change-Id: I827aafdc539f56d0ba565e3e342887a074f028bd

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