[PATCH] Use clock_gettime()'s CLOCK_REALTIME instead of gettimeofday() where possible

[Jonathan Roelofs]

I think the new bits here need to be guarded on a check for `#if (defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0)`, and otherwise fall back on the original implementation.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8253

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/