Corrects a "vl_unwire: page is not wired" and "kernel memory fault" panic
when the system is configured with gh_chunks or rad_gh_regions enabled and
new_wire_method = 1.

Also includes corrections for:

  A "pmap_ssm_lock_bit timeout" panic.

  A "cmn_err: CE_PANIC: elan0: heartbeat pacemaker - flatlined ...." panic
  seen on Sierra Cluster systems.

"vl_unwire: page is not wired"

  boot
  panic
  vl_unwire
  u_map_wire
  lw_unwire_new
  vm_map_pageable
  rdg_unwire_iodesc
  rdg_post_snd
  rdg_io_post
  rdg_syscall
  syscall
  _Xsyscall


"kernel memory fault"

  panic
  trap
  XentMM
  vl_unwire
  u_map_wire
  lw_unwire_new
  vm_map_pageable
  rdg_unwire_iodesc
  rdg_post_snd
  rdg_io_post
  rdg_syscall
  syscall
  _Xsyscall


"pmap_ssm_lock_bit timeout"

  panic
  xcpu_panic_ipir
  cpu_ip_intr
  _XentInt
  pmap_pt_access
  pmap_ssm_unmap
  pmap_ssm_enter_bigpage
  vm_map_ssm_bigpg
  u_ssm_fault
  u_map_fault
  vm_fault
  trap
  _XentMM


"cmn_err: CE_PANIC: elan0: heartbeat pacemaker - flatlined ...."

  panic
  xcpu_panic_ipir
  cpu_ip_intr
  _XentInt
  FindAndLockTask
  elan3mmu_coproc_tbi
  pmap_coproc_invalidate
  pmap_tbsync
  pmap_install_l3
  pmap_enter_bigpage
  vm_map_bigpg
  u_anon_update_pmap
  u_anon_fault_zfod
  u_anon_fault
  u_map_fault
  vm_fault
  trap
  _XentMM

