11859 need swapgs mitigation
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@fingolfin.org>

*** 170,190 ****
              "movw       %0, %%gs"
              : /* no output */
              : "r" (value));
  }
  
- #if !defined(__xpv)
- 
- extern __GNU_INLINE void
- __swapgs(void)
- {
-         __asm__ __volatile__(
-             "mfence; swapgs");
- }
- 
- #endif /* !__xpv */
- 
  #endif  /* __amd64 */
  
  #endif  /* !__lint && __GNUC__ */
  
  #ifdef  __cplusplus
--- 170,179 ----