message: [FileSystem] Fix ambiguous symbol on Windows.
  The using declarations make FileCollector ambiguous. Specify that
  FileSystem takes an lldb_private::FileCollector.
diff: @@ -49,7 +49,7 @@ void FileSystem::Initialize() {
  InstanceImpl().emplace();
  }
  -void FileSystem::Initialize(FileCollector &collector) {
  +void FileSystem::Initialize(lldb_private::FileCollector &collector) {
  lldbassert(!InstanceImpl() && "Already initialized.");
  InstanceImpl().emplace(collector);
  }
  