[clang] [Clang] [Sema] Improve handling of multidimensional subscript operator for builtin types (PR #187828)

[Weibo He via cfe-commits]

NewSigma wrote:

Hi @Sirraide , it seems clang rejects valid after this revision. See [godbolt](https://godbolt.org/z/d87zjcvhE)

https://github.com/llvm/llvm-project/pull/187828