[clang-tools-extra] [clang-tidy] Stop ignoring `-std` argument in `check_clang_tidy.py` for C files (PR #150791)

[Victor Chernyakin via cfe-commits]

================
@@ -374,15 +373,25 @@ def parse_arguments() -> Tuple[argparse.Namespace, List[str]]:
     parser.add_argument(
         "-std",
         type=csv,
-        default=["c++11-or-later"],
+        default=None,
         help="Passed to clang. Special -or-later values are expanded.",
     )
     parser.add_argument(
         "--match-partial-fixes",
         action="store_true",
         help="allow partial line matches for fixes",
     )
-    return parser.parse_known_args()
+
+    args, extra_args = parser.parse_known_args()
+    if args.std is None:
+        _, extension = os.path.splitext(args.assume_filename or args.input_file_name)
+        args.std = (
+            ["c++11-or-later"]
+            if extension in [".cpp", ".hpp", ".mm"]
+            else ["c99-or-later"]
----------------
localspook wrote:

That's just how black seems to format it 🤔

https://github.com/llvm/llvm-project/pull/150791