[clang-tidy] For run-clang-tidy.py escape the paths that are used for analysis.

Some paths can have special chars like `file++c.cpp` in this case the regex will
fail if we don't escape it.

clang-tools-extra/clang-tidy/tool/run-clang-tidy.py

@@ -277,6 +277,7 @@ def main():
     tmpdir = tempfile.mkdtemp()
 
   # Build up a big regexy filter from all command line arguments.
+  args.files = [re.escape(f) for f in args.files]
   file_name_re = re.compile('|'.join(args.files))
 
   return_code = 0