Update from https://crrev.com/305340

tools/clang/rewrite_scoped_refptr/RewriteScopedRefptr.cpp

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This implements a Clang tool to rewrite all instances of
 // scoped_refptr<T>'s implicit cast to T (operator T*) to an explicit call to
 // the .get() method.
 
 #include <assert.h>
 #include <algorithm>
 #include <memory>
 #include <string>
 
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
 #include "clang/ASTMatchers/ASTMatchersMacros.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/Lex/Lexer.h"
 #include "clang/Tooling/CommonOptionsParser.h"
 #include "clang/Tooling/Refactoring.h"
 #include "clang/Tooling/Tooling.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/support/TargetSelect.h"
 
 using namespace clang::ast_matchers;
 using clang::tooling::CommonOptionsParser;
 using clang::tooling::Replacement;
 using clang::tooling::Replacements;
 using llvm::StringRef;
 
 namespace clang {
 namespace ast_matchers {
 
@@ skipping 213 matching lines @@
   const clang::Expr* const expr = result.Nodes.getNodeAs<clang::Expr>("expr");
   assert(expr && "Unexpected match! No Expr captured!");
   replacements_->insert(RewriteImplicitToExplicitConversion(result, expr));
 }
 
 }  // namespace
 
 static llvm::cl::extrahelp common_help(CommonOptionsParser::HelpMessage);
 
 int main(int argc, const char* argv[]) {
+  // TODO(dcheng): Clang tooling should do this itself.
+  // http://llvm.org/bugs/show_bug.cgi?id=21627
+  llvm::InitializeNativeTarget();
+  llvm::InitializeNativeTargetAsmParser();
   llvm::cl::OptionCategory category("Remove scoped_refptr conversions");
   CommonOptionsParser options(argc, argv, category);
   clang::tooling::ClangTool tool(options.getCompilations(),
                                  options.getSourcePathList());
 
   MatchFinder match_finder;
   Replacements replacements;
 
   auto is_scoped_refptr = recordDecl(isSameOrDerivedFrom("::scoped_refptr"),
                                      isTemplateInstantiation());
@@ skipping 151 matching lines @@
   for (const auto& r : replacements) {
     std::string replacement_text = r.getReplacementText().str();
     std::replace(replacement_text.begin(), replacement_text.end(), '\n', '\0');
     llvm::outs() << "r:::" << r.getFilePath() << ":::" << r.getOffset() << ":::"
                  << r.getLength() << ":::" << replacement_text << "\n";
   }
   llvm::outs() << "==== END EDITS ====\n";
 
   return 0;
 }