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

@@ -27,11 +27,11 @@
 # Copyright 2015 Igor Kozhukhov <ikozhukhov@gmail.com>
 # Copyright 2017 Nexenta Systems, Inc.
 # Copyright 2016 Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
 # Copyright 2019 Peter Tribble.
 # Copyright 2015, Joyent, Inc. All rights reserved.
-# Copyright 2022 Oxide Computer Company
+# Copyright 2023 Oxide Computer Company
 #
 
 include $(SRC)/uts/Makefile.uts
 
 FILEMODE=644

@@ -549,10 +549,11 @@
         srn.h                   \
         sservice.h              \
         stat.h                  \
         statfs.h                \
         statvfs.h               \
+        stdalign.h              \
         stdbool.h               \
         stddef.h                \
         stdint.h                \
         stermio.h               \
         stmf.h                  \