Add an isReachableFromEntry method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52916 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/Dominators.h

@@ -792,6 +792,10 @@ public:
     DT->splitBlock(NewBB);
   }
   
+  bool isReachableFromEntry(BasicBlock* A) {
+    return DT->isReachableFromEntry(A);
+  }
+  
   
   virtual void releaseMemory() { 
     DT->releaseMemory();