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diff --git a/include/llvm/ExecutionEngine/Orc/LookasideRTDyldMM.h b/include/llvm/ExecutionEngine/Orc/LookasideRTDyldMM.h
deleted file mode 100644
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--- a/include/llvm/ExecutionEngine/Orc/LookasideRTDyldMM.h
+++ /dev/null
@@ -1,92 +0,0 @@
-//===- LookasideRTDyldMM - Redirect symbol lookup via a functor -*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-//   Defines an adapter for RuntimeDyldMM that allows lookups for external
-// symbols to go via a functor.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_EXECUTIONENGINE_ORC_LOOKASIDERTDYLDMM_H
-#define LLVM_EXECUTIONENGINE_ORC_LOOKASIDERTDYLDMM_H
-
-#include "llvm/ADT/STLExtras.h"
-#include <memory>
-#include <vector>
-
-namespace llvm {
-namespace orc {
-
-/// @brief Defines an adapter for RuntimeDyldMM that allows lookups for external
-///        symbols to go via a functor, before falling back to the lookup logic
-///        provided by the underlying RuntimeDyldMM instance.
-///
-///   This class is useful for redirecting symbol lookup back to various layers
-/// of a JIT component stack, e.g. to enable lazy module emission.
-///
-template <typename BaseRTDyldMM, typename ExternalLookupFtor,
-          typename DylibLookupFtor>
-class LookasideRTDyldMM : public BaseRTDyldMM {
-public:
-  /// @brief Create a LookasideRTDyldMM intance.
-  LookasideRTDyldMM(ExternalLookupFtor ExternalLookup,
-                    DylibLookupFtor DylibLookup)
-      : ExternalLookup(std::move(ExternalLookup)),
-        DylibLookup(std::move(DylibLookup)) {}
-
-  /// @brief Look up the given symbol address, first via the functor this
-  ///        instance was created with, then (if the symbol isn't found)
-  ///        via the underlying RuntimeDyldMM.
-  uint64_t getSymbolAddress(const std::string &Name) override {
-    if (uint64_t Addr = ExternalLookup(Name))
-      return Addr;
-    return BaseRTDyldMM::getSymbolAddress(Name);
-  }
-
-  uint64_t getSymbolAddressInLogicalDylib(const std::string &Name) override {
-    if (uint64_t Addr = DylibLookup(Name))
-      return Addr;
-    return BaseRTDyldMM::getSymbolAddressInLogicalDylib(Name);
-  };
-
-  /// @brief Get a reference to the ExternalLookup functor.
-  ExternalLookupFtor &getExternalLookup() { return ExternalLookup; }
-
-  /// @brief Get a const-reference to the ExternalLookup functor.
-  const ExternalLookupFtor &getExternalLookup() const { return ExternalLookup; }
-
-  /// @brief Get a reference to the DylibLookup functor.
-  DylibLookupFtor &getDylibLookup() { return DylibLookup; }
-
-  /// @brief Get a const-reference to the DylibLookup functor.
-  const DylibLookupFtor &getDylibLookup() const { return DylibLookup; }
-
-private:
-  ExternalLookupFtor ExternalLookup;
-  DylibLookupFtor DylibLookup;
-};
-
-/// @brief Create a LookasideRTDyldMM from a base memory manager type, an
-///        external lookup functor, and a dylib lookup functor.
-template <typename BaseRTDyldMM, typename ExternalLookupFtor,
-          typename DylibLookupFtor>
-std::unique_ptr<
-    LookasideRTDyldMM<BaseRTDyldMM, ExternalLookupFtor, DylibLookupFtor>>
-createLookasideRTDyldMM(ExternalLookupFtor &&ExternalLookup,
-                        DylibLookupFtor &&DylibLookup) {
-  typedef LookasideRTDyldMM<BaseRTDyldMM, ExternalLookupFtor, DylibLookupFtor>
-      ThisLookasideMM;
-  return llvm::make_unique<ThisLookasideMM>(
-      std::forward<ExternalLookupFtor>(ExternalLookup),
-      std::forward<DylibLookupFtor>(DylibLookup));
-}
-
-} // End namespace orc.
-} // End namespace llvm.
-
-#endif // LLVM_EXECUTIONENGINE_ORC_LOOKASIDERTDYLDMM_H