15254 %ymm registers not restored after signal handler
15367 x86 getfpregs() summons corrupting %xmm ghosts
15333 want x86 /proc xregs support (libc_db, libproc, mdb, etc.)
15336 want libc functions for extended ucontext_t
15334 want ps_lwphandle-specific reg routines
15328 FPU_CW_INIT mistreats reserved bit
15335 i86pc fpu_subr.c isn't really platform-specific
15332 setcontext(2) isn't actually noreturn
15331 need <sys/stdalign.h>
Change-Id: I7060aa86042dfb989f77fc3323c065ea2eafa9ad
Conflicts:
    usr/src/uts/common/fs/proc/prcontrol.c
    usr/src/uts/intel/os/archdep.c
    usr/src/uts/intel/sys/ucontext.h
    usr/src/uts/intel/syscall/getcontext.c

*** 203,213 ****
  
  struct proc;
  struct prpriv;
  struct cred;
  
! extern int priv_prgetprivsize(struct prpriv *);
  extern void cred2prpriv(const struct cred *, struct prpriv *);
  extern int priv_pr_spriv(struct proc *, struct prpriv *, const struct cred *);
  
  extern priv_impl_info_t *priv_hold_implinfo(void);
  extern void priv_release_implinfo(void);
--- 203,213 ----
  
  struct proc;
  struct prpriv;
  struct cred;
  
! extern int priv_prgetprivsize(const struct prpriv *);
  extern void cred2prpriv(const struct cred *, struct prpriv *);
  extern int priv_pr_spriv(struct proc *, struct prpriv *, const struct cred *);
  
  extern priv_impl_info_t *priv_hold_implinfo(void);
  extern void priv_release_implinfo(void);