Add basic block level properlyDominates(A,B) interface.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37497 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/Dominators.h

@@ -160,6 +160,10 @@ protected:
     return dominatedBySlowTreeWalk(A, B);
   }
 
+  inline bool properlyDominates(BasicBlock *A, BasicBlock *B) {
+    return properlyDominates(getNode(A), getNode(B));
+  }
+
   bool dominatedBySlowTreeWalk(const DomTreeNode *A, 
                                const DomTreeNode *B) const {
     const DomTreeNode *IDom;