80e4a3f7a6
This patch adds support for clock_gettime for Darwin. Darwin syscall 'gettimeofday' is used to query the time from the system. Many headers in llvm-libc-types, namely clockid_t, struct_timespec, struct_timeval, suseconds_t, time_t_32, time_t_64, are modified to include header guards as Darwin has its own implementation of primitive types.