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diff --git a/clang-r353983/include/llvm/CodeGen/ScheduleDAGMutation.h b/clang-r353983/include/llvm/CodeGen/ScheduleDAGMutation.h
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+++ b/clang-r353983/include/llvm/CodeGen/ScheduleDAGMutation.h
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+//===- ScheduleDAGMutation.h - MachineInstr Scheduling ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the ScheduleDAGMutation class, which represents
+// a target-specific mutation of the dependency graph for scheduling.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
+#define LLVM_CODEGEN_SCHEDULEDAGMUTATION_H
+
+namespace llvm {
+
+class ScheduleDAGInstrs;
+
+/// Mutate the DAG as a postpass after normal DAG building.
+class ScheduleDAGMutation {
+  virtual void anchor();
+
+public:
+  virtual ~ScheduleDAGMutation() = default;
+
+  virtual void apply(ScheduleDAGInstrs *DAG) = 0;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_SCHEDULEDAGMUTATION_H