kernel - vm_object work

kernel - vm_object work

* Adjust OBJT_SWAP object management to be more SMP friendly.  The hash
  table now uses a combined structure to reduce unnecessary cache
  interactions.

* Allocate VM objects via kmalloc() instead of zalloc.  Remove the zalloc
  pool for VM objects and use kmalloc().  Early initialization of the kernel
  does not have to access vm_object allocation functions until after basic
  VM initialization.

* Remove a vm_page_cache console warning that is no longer applicable.
  (It could be triggered by the RSS rlimit handling code).