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

*** 76,85 ****
--- 76,93 ----
  $endif
  $if _x86 && _ELF64
  $add amd64
  $endif
  
+ SYMBOL_VERSION ILLUMOS_0.41 {
+     protected:
+         getcontext_extd;
+         swapcontext_extd;
+         ucontext_alloc;
+         ucontext_free;
+ } ILLUMOS_0.40;
+ 
  SYMBOL_VERSION ILLUMOS_0.40 {
      protected:
          errc;
          verrc;
          vwarnc;