Hansang Bae ffb21e7f05 [OpenMP] Enable omp_get_num_devices() on Windows
This patch enables omp_get_num_devices() and omp_get_initial_device() on
Windows by providing an alternative to dlsym on Windows, and proposes to
add a new libomptarget entry, __tgt_get_num_devices().

Differential Revision: https://reviews.llvm.org/D96182
2021-02-11 14:53:48 -06:00
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