Add support for kernel threads in kvm_getprocs() and the underlying kvm_proclist() in libkvm when fetching from a kernel core file. This has been missing/needed for several releases, when kernel threads became normal threads. The loop over the processes now contains a sub-loop for threads, which iterates beyond the first thread only when threads are requested. Also set some fields such as tid that were previously uninitialized. Reviewed by: vangyzen jhb(earlier revision) MFC after: 4 days Sponsored by: Forcepoint LLC Differential Revision: https://reviews.freebsd.org/D21461
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