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

[Marshall Clow]

> Indeed, I added _LIBCPP_HAS_NO_MONOTONIC_CLOCK for exactly the situation @hfinkel describes: my platform doesn't have access to a monotonic clock.


Note that if you don't have a monotonic clock, none of the thread/mutex/etc stuff will compile.
The only way that @jroelofs does this is to also define _LIBCPP_HAS_NO_THREADS.

The C++ standard *requires* that an implementation have a monotonic clock.


http://reviews.llvm.org/D8253

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