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diff --git a/contrib/llvm/lib/CodeGen/MIRParser/MILexer.h b/contrib/llvm/lib/CodeGen/MIRParser/MILexer.h
new file mode 100644
index 000000000000..32fc8ab271e6
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/MIRParser/MILexer.h
@@ -0,0 +1,196 @@
+//===- MILexer.h - Lexer for machine instructions -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the function that lexes the machine instruction source
+// string.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_MIRPARSER_MILEXER_H
+#define LLVM_LIB_CODEGEN_MIRPARSER_MILEXER_H
+
+#include "llvm/ADT/APSInt.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/STLExtras.h"
+#include <functional>
+
+namespace llvm {
+
+class Twine;
+
+/// A token produced by the machine instruction lexer.
+struct MIToken {
+  enum TokenKind {
+    // Markers
+    Eof,
+    Error,
+    Newline,
+
+    // Tokens with no info.
+    comma,
+    equal,
+    underscore,
+    colon,
+    coloncolon,
+    exclaim,
+    lparen,
+    rparen,
+    lbrace,
+    rbrace,
+    plus,
+    minus,
+    less,
+    greater,
+
+    // Keywords
+    kw_implicit,
+    kw_implicit_define,
+    kw_def,
+    kw_dead,
+    kw_killed,
+    kw_undef,
+    kw_internal,
+    kw_early_clobber,
+    kw_debug_use,
+    kw_tied_def,
+    kw_frame_setup,
+    kw_debug_location,
+    kw_cfi_same_value,
+    kw_cfi_offset,
+    kw_cfi_def_cfa_register,
+    kw_cfi_def_cfa_offset,
+    kw_cfi_def_cfa,
+    kw_blockaddress,
+    kw_target_index,
+    kw_half,
+    kw_float,
+    kw_double,
+    kw_x86_fp80,
+    kw_fp128,
+    kw_ppc_fp128,
+    kw_target_flags,
+    kw_volatile,
+    kw_non_temporal,
+    kw_invariant,
+    kw_align,
+    kw_stack,
+    kw_got,
+    kw_jump_table,
+    kw_constant_pool,
+    kw_call_entry,
+    kw_liveout,
+    kw_address_taken,
+    kw_landing_pad,
+    kw_liveins,
+    kw_successors,
+
+    // Named metadata keywords
+    md_tbaa,
+    md_alias_scope,
+    md_noalias,
+    md_range,
+
+    // Identifier tokens
+    Identifier,
+    IntegerType,
+    NamedRegister,
+    MachineBasicBlockLabel,
+    MachineBasicBlock,
+    StackObject,
+    FixedStackObject,
+    NamedGlobalValue,
+    GlobalValue,
+    ExternalSymbol,
+
+    // Other tokens
+    IntegerLiteral,
+    FloatingPointLiteral,
+    VirtualRegister,
+    ConstantPoolItem,
+    JumpTableIndex,
+    NamedIRBlock,
+    IRBlock,
+    NamedIRValue,
+    IRValue,
+    QuotedIRValue, // `<constant value>`
+    SubRegisterIndex
+  };
+
+private:
+  TokenKind Kind;
+  StringRef Range;
+  StringRef StringValue;
+  std::string StringValueStorage;
+  APSInt IntVal;
+
+public:
+  MIToken() : Kind(Error) {}
+
+  MIToken &reset(TokenKind Kind, StringRef Range);
+
+  MIToken &setStringValue(StringRef StrVal);
+  MIToken &setOwnedStringValue(std::string StrVal);
+  MIToken &setIntegerValue(APSInt IntVal);
+
+  TokenKind kind() const { return Kind; }
+
+  bool isError() const { return Kind == Error; }
+
+  bool isNewlineOrEOF() const { return Kind == Newline || Kind == Eof; }
+
+  bool isErrorOrEOF() const { return Kind == Error || Kind == Eof; }
+
+  bool isRegister() const {
+    return Kind == NamedRegister || Kind == underscore ||
+           Kind == VirtualRegister;
+  }
+
+  bool isRegisterFlag() const {
+    return Kind == kw_implicit || Kind == kw_implicit_define ||
+           Kind == kw_def || Kind == kw_dead || Kind == kw_killed ||
+           Kind == kw_undef || Kind == kw_internal ||
+           Kind == kw_early_clobber || Kind == kw_debug_use;
+  }
+
+  bool isMemoryOperandFlag() const {
+    return Kind == kw_volatile || Kind == kw_non_temporal ||
+           Kind == kw_invariant;
+  }
+
+  bool is(TokenKind K) const { return Kind == K; }
+
+  bool isNot(TokenKind K) const { return Kind != K; }
+
+  StringRef::iterator location() const { return Range.begin(); }
+
+  StringRef range() const { return Range; }
+
+  /// Return the token's string value.
+  StringRef stringValue() const { return StringValue; }
+
+  const APSInt &integerValue() const { return IntVal; }
+
+  bool hasIntegerValue() const {
+    return Kind == IntegerLiteral || Kind == MachineBasicBlock ||
+           Kind == MachineBasicBlockLabel || Kind == StackObject ||
+           Kind == FixedStackObject || Kind == GlobalValue ||
+           Kind == VirtualRegister || Kind == ConstantPoolItem ||
+           Kind == JumpTableIndex || Kind == IRBlock || Kind == IRValue;
+  }
+};
+
+/// Consume a single machine instruction token in the given source and return
+/// the remaining source string.
+StringRef lexMIToken(
+    StringRef Source, MIToken &Token,
+    function_ref<void(StringRef::iterator, const Twine &)> ErrorCallback);
+
+} // end namespace llvm
+
+#endif