[clang] [Clang][Parser] Make 'T...[N]' within a function parameter a valid pack expansion prior to C++2c (PR #116332)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

Thanks you all for the feedback. So I'm going to keep it invalid and just add a warning for clarity.

https://github.com/llvm/llvm-project/pull/116332