- Demapping unused kernel TLB slots has proven to work reliably so move   the associated debugging under bootverbose. - Remove freebsd4_sigreturn(); given that FreeBSD 4 didn't supported   sparc64 this only ever served as a transition aid prior to FreeBSD   5.0 and is unused by default since COMPAT_FREEBSD4 was removed from   GENERIC in r143072 nearly 5 years ago.
- Demapping unused kernel TLB slots has proven to work reliably so move
  the associated debugging under bootverbose.
- Remove freebsd4_sigreturn(); given that FreeBSD 4 didn't supported
  sparc64 this only ever served as a transition aid prior to FreeBSD
  5.0 and is unused by default since COMPAT_FREEBSD4 was removed from
  GENERIC in r143072 nearly 5 years ago.

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