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diff --git a/contrib/llvm/include/llvm/Transforms/Utils/OrderedInstructions.h b/contrib/llvm/include/llvm/Transforms/Utils/OrderedInstructions.h
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+++ b/contrib/llvm/include/llvm/Transforms/Utils/OrderedInstructions.h
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+//===- llvm/Transforms/Utils/OrderedInstructions.h -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an efficient way to check for dominance relation between 2
+// instructions.
+//
+// This interface dispatches to appropriate dominance check given 2
+// instructions, i.e. in case the instructions are in the same basic block,
+// OrderedBasicBlock (with instruction numbering and caching) are used.
+// Otherwise, dominator tree is used.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
+#define LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/Analysis/OrderedBasicBlock.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Operator.h"
+
+namespace llvm {
+
+class OrderedInstructions {
+  /// Used to check dominance for instructions in same basic block.
+  mutable DenseMap<const BasicBlock *, std::unique_ptr<OrderedBasicBlock>>
+      OBBMap;
+
+  /// The dominator tree of the parent function.
+  DominatorTree *DT;
+
+public:
+  /// Constructor.
+  OrderedInstructions(DominatorTree *DT) : DT(DT) {}
+
+  /// Return true if first instruction dominates the second.
+  bool dominates(const Instruction *, const Instruction *) const;
+
+  /// Invalidate the OrderedBasicBlock cache when its basic block changes.
+  /// i.e. If an instruction is deleted or added to the basic block, the user
+  /// should call this function to invalidate the OrderedBasicBlock cache for
+  /// this basic block.
+  void invalidateBlock(const BasicBlock *BB) { OBBMap.erase(BB); }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H