10908 Simplify SMAP relocations with krtld

*** 183,199 ****
  extern void fakesoftint(void);
  
  extern void *plat_traceback(void *);
  
  /*
!  * The following two macros are the four byte instruction sequence of stac, ret
!  * and clac, ret. These are used in startup_smap() as a part of properly setting
!  * up the valid instructions. For more information on SMAP, see
!  * uts/intel/ia32/ml/copy.s.
   */
! #define SMAP_CLAC_INSTR 0xc3ca010f
! #define SMAP_STAC_INSTR 0xc3cb010f
  extern void smap_disable(void);
  extern void smap_enable(void);
  
  #if defined(__xpv)
  extern void xen_init_callbacks(void);
--- 183,203 ----
  extern void fakesoftint(void);
  
  extern void *plat_traceback(void *);
  
  /*
!  * The following two macros are the four byte instruction sequence of stac, nop
!  * and clac, nop. These are used in startup_smap() and hotinline_smap() as a
!  * part of properly setting up the valid instructions. For more information on
!  * SMAP, see uts/intel/ia32/ml/copy.s, uts/i86pc/os/machdep.c and
!  * uts/common/os/modctl.c.
!  *
!  * Note that smap_disable and smap_enable are resolved to stubs at compile time,
!  * but inlined at runtime by do_hotinlines() in uts/i86pc/os/machdep.c.
   */
! #define SMAP_CLAC_INSTR 0x90ca010f
! #define SMAP_STAC_INSTR 0x90cb010f
  extern void smap_disable(void);
  extern void smap_enable(void);
  
  #if defined(__xpv)
  extern void xen_init_callbacks(void);