6583 remove whole-process swapping

*** 128,141 ****
  struct brand;
  struct corectl_path;
  struct corectl_content;
  
  /*
!  * One structure allocated per active process.  It contains all
!  * data needed about the process while the process may be swapped
!  * out.  Other per-process data (user.h) is also inside the proc structure.
!  * Lightweight-process data (lwp.h) and the kernel stack may be swapped out.
   */
  typedef struct  proc {
          /*
           * Fields requiring no explicit locking
           */
--- 128,139 ----
  struct brand;
  struct corectl_path;
  struct corectl_content;
  
  /*
!  * One structure allocated per active process.  Per-process data (user.h) is
!  * also inside the proc structure.
   */
  typedef struct  proc {
          /*
           * Fields requiring no explicit locking
           */
*** 145,155 ****
          kmutex_t p_crlock;              /* lock for p_cred */
          struct  cred    *p_cred;        /* process credentials */
          /*
           * Fields protected by pidlock
           */
-         int     p_swapcnt;              /* number of swapped out lwps */
          char    p_stat;                 /* status of process */
          char    p_wcode;                /* current wait code */
          ushort_t p_pidflag;             /* flags protected only by pidlock */
          int     p_wdata;                /* current wait return value */
          pid_t   p_ppid;                 /* process id of parent */
--- 143,152 ----