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

@@ -86,10 +86,11 @@
 file path=usr/share/man/man2/getacct.2
 file path=usr/share/man/man2/getaudit.2
 link path=usr/share/man/man2/getaudit_addr.2 target=getaudit.2
 file path=usr/share/man/man2/getauid.2
 file path=usr/share/man/man2/getcontext.2
+link path=usr/share/man/man2/getcontext_extd.2 target=getcontext.2
 file path=usr/share/man/man2/getdents.2
 link path=usr/share/man/man2/getegid.2 target=getuid.2
 link path=usr/share/man/man2/geteuid.2 target=getuid.2
 link path=usr/share/man/man2/getgid.2 target=getuid.2
 file path=usr/share/man/man2/getgroups.2