[clang-move] Fix unit tests with forward slash as separator on windows

[aaron.ballman]

LGTM aside from commenting nit.

clang-tools-extra/unittests/clang-move/ClangMoveTests.cpp

235

Might as well remove this comment entirely? I don't think it adds any value, it looks like debug code that was left in by accident.

[mstorsjo]

clang-tools-extra/unittests/clang-move/ClangMoveTests.cpp

235

Sure, I can remove it.

clang-tools-extra/unittests/clang-move/ClangMoveTests.cpp

 
 std::map<std::string, std::string>
 runClangMoveOnCode(const move::MoveDefinitionSpec &Spec,
                    const char *const Header = TestHeader,
                    const char *const CC = TestCC,
                    DeclarationReporter *const Reporter = nullptr) {
   clang::RewriterTestContext Context;
 
-  Context.InMemoryFileSystem->setCurrentWorkingDirectory(WorkingDir);
+  llvm::SmallString<16> Dir(WorkingDir);
+  llvm::sys::path::native(Dir);
+  Context.InMemoryFileSystem->setCurrentWorkingDirectory(Dir);
 
   std::map<llvm::StringRef, clang::FileID> FileToFileID;
 
   auto CreateFiles = [&Context, &FileToFileID](llvm::StringRef Name,
                                                llvm::StringRef Code) {
     if (!Name.empty()) {
       FileToFileID[Name] = Context.createInMemoryFile(Name, Code);
     }
   };
   CreateFiles(Spec.NewCC, "");
   CreateFiles(Spec.NewHeader, "");
   CreateFiles(TestHeaderName, Header);
   CreateFiles(TestCCName, CC);
 
   std::map<std::string, tooling::Replacements> FileToReplacements;
-  ClangMoveContext MoveContext = {Spec, FileToReplacements, WorkingDir, "LLVM",
+  ClangMoveContext MoveContext = {Spec, FileToReplacements, Dir.c_str(), "LLVM",
                                   Reporter != nullptr};
 
   auto Factory = std::make_unique<clang::move::ClangMoveActionFactory>(
       &MoveContext, Reporter);
 
- // std::string IncludeArg = Twine("-I" + WorkingDir;
+ // std::string IncludeArg = Twine("-I" + Dir;
   tooling::runToolOnCodeWithArgs(
       Factory->create(), CC, Context.InMemoryFileSystem,
       {"-std=c++11", "-fparse-all-comments", "-I."}, TestCCName, "clang-move",
       std::make_shared<PCHContainerOperations>());
   formatAndApplyAllReplacements(FileToReplacements, Context.Rewrite, "llvm");
   // The Key is file name, value is the new code after moving the class.
   std::map<std::string, std::string> Results;
   for (const auto &It : FileToReplacements) {