ART: Topological Sort Traversal Implementation

ART: Topological Sort Traversal Implementation

- Added a topological sort implementation for traversal.
  - Useful for traversals that require traversing the predecessors first.
- Added a function to BasicBlock to detect if it is an exception block.

Change-Id: I573da1768a635c6fd0259573dbb46b112132e129
Signed-off-by: Jean Christophe Beyler <jean.christophe.beyler@intel.com>
Signed-off-by: Razvan A Lupusoru <razvan.a.lupusoru@intel.com>
Signed-off-by: Yixin Shou <yixin.shou@intel.com>
Signed-off-by: Chao-ying Fu <chao-ying.fu@intel.com>
Signed-off-by: Udayan Banerji <udayan.banerji@intel.com>