MFC r259612: ttm_bo_vm_lookup_rb: actually make use of the red-black tree
MFC r259612: ttm_bo_vm_lookup_rb: actually make use of the red-black tree

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase