[clang] [clang-format] Fix a crash on triple-bracket input like `[[[a]]` (PR #199103)

[Björn Schäpers via cfe-commits]

================
@@ -90,6 +90,9 @@ static bool isCppAttribute(bool IsCpp, const FormatToken &Tok) {
   // The first square bracket is part of an ObjC array literal
   if (Tok.Previous && Tok.Previous->is(tok::at))
     return false;
+  // Avoid mis-annotating the inner '[[' of malformed input.
+  if (Tok.Previous && Tok.Previous->is(tok::l_square))
----------------
HazardyKnusperkeks wrote:

```suggestion
if (Tok.Previous && Tok.Previous->isOneOf(tok::at, tok::l_square))
return false;
```
You can merge the comments.

https://github.com/llvm/llvm-project/pull/199103