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diff --git a/clang-r353983e/include/llvm/MC/SubtargetFeature.h b/clang-r353983e/include/llvm/MC/SubtargetFeature.h
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+//===- llvm/MC/SubtargetFeature.h - CPU characteristics ---------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file Defines and manages user or tool specified CPU characteristics.
+/// The intent is to be able to package specific features that should or should
+/// not be used on a specific target processor.  A tool, such as llc, could, as
+/// as example, gather chip info from the command line, a long with features
+/// that should be used on that chip.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_SUBTARGETFEATURE_H
+#define LLVM_MC_SUBTARGETFEATURE_H
+
+#include "llvm/ADT/StringRef.h"
+#include <bitset>
+#include <initializer_list>
+#include <string>
+#include <vector>
+
+namespace llvm {
+
+template <typename T> class ArrayRef;
+class raw_ostream;
+class Triple;
+
+const unsigned MAX_SUBTARGET_FEATURES = 192;
+/// Container class for subtarget features.
+/// This is convenient because std::bitset does not have a constructor
+/// with an initializer list of set bits.
+class FeatureBitset : public std::bitset<MAX_SUBTARGET_FEATURES> {
+public:
+  // Cannot inherit constructors because it's not supported by VC++..
+  FeatureBitset() = default;
+
+  FeatureBitset(const bitset<MAX_SUBTARGET_FEATURES>& B) : bitset(B) {}
+
+  FeatureBitset(std::initializer_list<unsigned> Init) {
+    for (auto I : Init)
+      set(I);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+
+/// Used to provide key value pairs for feature and CPU bit flags.
+struct SubtargetFeatureKV {
+  const char *Key;                      ///< K-V key string
+  const char *Desc;                     ///< Help descriptor
+  FeatureBitset Value;                  ///< K-V integer value
+  FeatureBitset Implies;                ///< K-V bit mask
+
+  /// Compare routine for std::lower_bound
+  bool operator<(StringRef S) const {
+    return StringRef(Key) < S;
+  }
+
+  /// Compare routine for std::is_sorted.
+  bool operator<(const SubtargetFeatureKV &Other) const {
+    return StringRef(Key) < StringRef(Other.Key);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+
+/// Used to provide key value pairs for CPU and arbitrary pointers.
+struct SubtargetInfoKV {
+  const char *Key;                      ///< K-V key string
+  const void *Value;                    ///< K-V pointer value
+
+  /// Compare routine for std::lower_bound
+  bool operator<(StringRef S) const {
+    return StringRef(Key) < S;
+  }
+};
+
+//===----------------------------------------------------------------------===//
+
+/// Manages the enabling and disabling of subtarget specific features.
+///
+/// Features are encoded as a string of the form
+///   "+attr1,+attr2,-attr3,...,+attrN"
+/// A comma separates each feature from the next (all lowercase.)
+/// Each of the remaining features is prefixed with + or - indicating whether
+/// that feature should be enabled or disabled contrary to the cpu
+/// specification.
+class SubtargetFeatures {
+  std::vector<std::string> Features;    ///< Subtarget features as a vector
+
+public:
+  explicit SubtargetFeatures(StringRef Initial = "");
+
+  /// Returns features as a string.
+  std::string getString() const;
+
+  /// Adds Features.
+  void AddFeature(StringRef String, bool Enable = true);
+
+  /// Toggles a feature and update the feature bits.
+  static void ToggleFeature(FeatureBitset &Bits, StringRef String,
+                            ArrayRef<SubtargetFeatureKV> FeatureTable);
+
+  /// Applies the feature flag and update the feature bits.
+  static void ApplyFeatureFlag(FeatureBitset &Bits, StringRef Feature,
+                               ArrayRef<SubtargetFeatureKV> FeatureTable);
+
+  /// Returns feature bits of a CPU.
+  FeatureBitset getFeatureBits(StringRef CPU,
+                               ArrayRef<SubtargetFeatureKV> CPUTable,
+                               ArrayRef<SubtargetFeatureKV> FeatureTable);
+
+  /// Returns the vector of individual subtarget features.
+  const std::vector<std::string> &getFeatures() const { return Features; }
+
+  /// Prints feature string.
+  void print(raw_ostream &OS) const;
+
+  // Dumps feature info.
+  void dump() const;
+
+  /// Adds the default features for the specified target triple.
+  void getDefaultSubtargetFeatures(const Triple& Triple);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_MC_SUBTARGETFEATURE_H