Second attempt to fix clang-move tests broken by r332590 on windows

http://lab.llvm.org:8011/builders/clang-x86-windows-msvc2015/builds/12010

Add back a path conversion removed in a previous attempt. I removed it
because it didn't seem necessary. Added it back to see if this would fix
the bot.

llvm-svn: 332612

clang-tools-extra/clang-move/ClangMove.cpp

@@ -64,6 +64,8 @@ AST_MATCHER_P(CXXMethodDecl, ofOutermostEnclosingClass,
 std::string CleanPath(StringRef PathRef) {
   llvm::SmallString<128> Path(PathRef);
   llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
+  // FIXME: figure out why this is necessary.
+  llvm::sys::path::native(Path);
   return Path.str();
 }