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

[via cfe-commits]

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@@ -87,8 +87,7 @@ static bool isKeywordWithCondition(const FormatToken &Tok) {
 static bool isCppAttribute(bool IsCpp, const FormatToken &Tok) {
   if (!IsCpp || !Tok.startsSequence(tok::l_square, tok::l_square))
     return false;
-  // The first square bracket is part of an ObjC array literal
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mydeveloperday wrote:

why was there not value in keeping the comment in some form.. 

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