[OpenMP] Fix HWLOC topology detection for 2.0.x

HWLOC 2.0 has numa nodes as separate children and are not in the main
parent/child topology tree anymore.  This change takes this into
account.  The main topology detection loop in the create_hwloc_map()
routine starts at a hardware thread within the initial affinity mask and
goes up the topology tree setting the socket/core/thread labels
correctly.

This change also introduces some of the more generic changes that the
future kmp_topology_t structure will take advantage of including a
generic ratio & count array (finding all ratios of topology layers like
threads/core cores/socket and finding all counts of each topology
layer), generic radix1 reduction step, generic uniformity check, and
generic printing of topology (en_US.txt)

Differential Revision: https://reviews.llvm.org/D95156