Add an isReachableFromEntry to MachineDominators, following the one

in Dominators.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100454 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineDominators.h

@@ -157,6 +157,11 @@ public:
     DT->splitBlock(NewBB);
   }
 
+  /// isReachableFromEntry - Return true if A is dominated by the entry
+  /// block of the function containing it.
+  bool isReachableFromEntry(MachineBasicBlock *A) {
+    return DT->isReachableFromEntry(A);
+  }
 
   virtual void releaseMemory();