[OpenMP] Add L2-Tile equivalence for KNL

[jlpeyton]

Summary

When on KNL and L2 or Tile layer is detected, manually add the corresponding layer which is equivalent.

[AndreyChurbanov]

LGTM

openmp/runtime/src/kmp_affinity.cpp

 void kmp_topology_t::canonicalize() {
   _remove_radix1_layers();
   _gather_enumeration_information();
   _discover_uniformity();
   _set_sub_ids();
   _set_globals();
   _set_last_level_cache();
 
+#if KMP_MIC_SUPPORTED
+  // Manually Add L2 = Tile equivalence
+  if (__kmp_mic_type == mic3) {
+    if (get_level(KMP_HW_L2) != -1)
+      set_equivalent_type(KMP_HW_TILE, KMP_HW_L2);
+    else if (get_level(KMP_HW_TILE) != -1)
+      set_equivalent_type(KMP_HW_L2, KMP_HW_TILE);
+  }
+#endif
+
   // Perform post canonicalization checking
   KMP_ASSERT(depth > 0);
   for (int level = 0; level < depth; ++level) {
     // All counts, ratios, and types must be valid
     KMP_ASSERT(count[level] > 0 && ratio[level] > 0);
     KMP_ASSERT_VALID_HW_TYPE(types[level]);
     // Detected types must point to themselves
     KMP_ASSERT(equivalent[types[level]] == types[level]);