Fix unittest build issue in r366956

I marked the fields as private, but they're needed by the unittest.
I'll have to fix that up separarely in a follow-up.

llvm-svn: 366958

diff --git a/llvm/include/llvm/Support/FileCollector.h b/llvm/include/llvm/Support/FileCollector.h
index bf0aa59..518546a 100644 (file)
--- a/llvm/include/llvm/Support/FileCollector.h
+++ b/llvm/include/llvm/Support/FileCollector.h
@@ -50,6 +50,7 @@ private:
     m_vfs_writer.addFileMapping(virtual_path, real_path);
   }
 
+protected:
   /// Synchronizes adding files.
   std::mutex m_mutex;