[clang-format] [PR36858] Add missing .hh and .cs extensions from python support utilities

[MyDeveloperDay]

Summary

https://bugs.llvm.org/show_bug.cgi?id=36858 identifies .hh as a missing C++ header extension file while making this change I realized there was no support for .cs files which were added recently

[klimek]

lg

[MyDeveloperDay]

We are also missing json

cfe/trunk/tools/clang-format/clang-format-diff.py

def main():
   parser.add_argument('-i', action='store_true', default=False,
                       help='apply edits to files instead of displaying a diff')
   parser.add_argument('-p', metavar='NUM', default=0,
                       help='strip the smallest prefix containing P slashes')
   parser.add_argument('-regex', metavar='PATTERN', default=None,
                       help='custom pattern selecting file paths to reformat '
                       '(case sensitive, overrides -iregex)')
   parser.add_argument('-iregex', metavar='PATTERN', default=
-                      r'.*\.(cpp|cc|c\+\+|cxx|c|cl|h|hpp|m|mm|inc|js|ts|proto'
-                      r'|protodevel|java)',
+                      r'.*\.(cpp|cc|c\+\+|cxx|c|cl|h|hh|hpp|m|mm|inc|js|ts|proto'
+                      r'|protodevel|java|cs)',
                       help='custom pattern selecting file paths to reformat '
                       '(case insensitive, overridden by -regex)')
   parser.add_argument('-sort-includes', action='store_true', default=False,
                       help='let clang-format sort include blocks')
   parser.add_argument('-v', '--verbose', action='store_true',
                       help='be more verbose, ineffective without -i')
   parser.add_argument('-style',
                       help='formatting style to apply (LLVM, Google, Chromium, '

cfe/trunk/tools/clang-format/git-clang-format

else:
     dash_dash = argv[idx:]
     argv = argv[:idx]
 
   default_extensions = ','.join([
       # From clang/lib/Frontend/FrontendOptions.cpp, all lower case
       'c', 'h',  # C
       'm',  # ObjC
       'mm',  # ObjC++
-      'cc', 'cp', 'cpp', 'c++', 'cxx', 'hpp', 'hxx',  # C++
+      'cc', 'cp', 'cpp', 'c++', 'cxx', 'hh', 'hpp', 'hxx',  # C++
       'cu',  # CUDA
       # Other languages that clang-format supports
       'proto', 'protodevel',  # Protocol Buffers
       'java',  # Java
       'js',  # JavaScript
       'ts',  # TypeScript
+      'cs',  # C Sharp
       ])
 
   p = argparse.ArgumentParser(
     usage=usage, formatter_class=argparse.RawDescriptionHelpFormatter,
     description=desc)
   p.add_argument('--binary',
                  default=config.get('clangformat.binary', 'clang-format'),
                  help='path to clang-format'),