[Lexer] Allow LLLexer to be used as an API

[wsmoses]

Summary

Explose LLVM Lexer for usage externally as an API

[jdoerfert]

Moving the 3 files into the include directory seems fine to me.

llvm/lib/AsmParser/LLLexer.cpp

 //===- LLLexer.cpp - Lexer for .ll Files ----------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
 // Implement the Lexer for .ll files.
 //
 //===----------------------------------------------------------------------===//
 
-#include "LLLexer.h"
+#include "llvm/AsmParser/LLLexer.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/SourceMgr.h"

llvm/lib/AsmParser/LLParser.cpp

 //===-- LLParser.cpp - Parser Class ---------------------------------------===//
 //
 // 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 defines the parser class for .ll files.
 //
 //===----------------------------------------------------------------------===//
 
-#include "LLParser.h"
-#include "LLToken.h"
+#include "llvm/AsmParser/LLParser.h"
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/AsmParser/LLToken.h"
 #include "llvm/AsmParser/SlotMapping.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/IR/Argument.h"
 #include "llvm/IR/AutoUpgrade.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/CallingConv.h"
 #include "llvm/IR/Comdat.h"
 #include "llvm/IR/ConstantRange.h"

llvm/lib/AsmParser/Parser.cpp

 //===- Parser.cpp - Main dispatch module for the Parser library -----------===//
 //
 // 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 library implements the functionality defined in llvm/AsmParser/Parser.h
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/AsmParser/Parser.h"
-#include "LLParser.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/AsmParser/LLParser.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/ModuleSummaryIndex.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/SourceMgr.h"
 #include <cstring>
 #include <system_error>
 
 using namespace llvm;