Add method to check to see if two _Instructions_ dominate each other

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2616 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/Dominators.h

@@ -20,6 +20,7 @@
 
 #include "llvm/Pass.h"
 #include <set>
+class Instruction;
 
 //===----------------------------------------------------------------------===//
 //
@@ -95,6 +96,12 @@ public:
     return getDominators(B).count(A) != 0;
   }
 
+  // dominates - Return true if A dominates B.  This performs the special checks
+  // neccesary if A and B are in the same basic block.
+  //
+  bool dominates(Instruction *A, Instruction *B) const;
+
+
   // getAnalysisUsage - This obviously provides a dominator set, but it also
   // uses the UnifyFunctionExitNode pass if building post-dominators
   //