llvm dev - Sep 2015 - Does LLVM OpenMP reuse threads by pooling?

Hi,
I've read the link
https://software.intel.com/en-us/articles/performance-obstacles-for-threading-how-do-they-affect-openmp-code
that says the thread pooling technique may be used by OpenMP implementation.
Does LLVM's OpenMP implemented this?

Thank you,
J
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