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diff --git a/llvm/lib/CodeGen/Spiller.h b/llvm/lib/CodeGen/Spiller.h
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+++ b/llvm/lib/CodeGen/Spiller.h
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+//===- llvm/CodeGen/Spiller.h - Spiller -------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_SPILLER_H
+#define LLVM_LIB_CODEGEN_SPILLER_H
+
+namespace llvm {
+
+class LiveRangeEdit;
+class MachineFunction;
+class MachineFunctionPass;
+class VirtRegMap;
+
+  /// Spiller interface.
+  ///
+  /// Implementations are utility classes which insert spill or remat code on
+  /// demand.
+  class Spiller {
+    virtual void anchor();
+
+  public:
+    virtual ~Spiller() = 0;
+
+    /// spill - Spill the LRE.getParent() live interval.
+    virtual void spill(LiveRangeEdit &LRE) = 0;
+
+    virtual void postOptimization() {}
+  };
+
+  /// Create and return a spiller that will insert spill code directly instead
+  /// of deferring though VirtRegMap.
+  Spiller *createInlineSpiller(MachineFunctionPass &pass,
+                               MachineFunction &mf,
+                               VirtRegMap &vrm);
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_CODEGEN_SPILLER_H