[clang] [Clang][P1061] Add stuctured binding packs (PR #121417)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 commented:

Thanks for working on this. I left some comments, and I think we need more tests for contexts e.g. templated member functions/nested dependent lambdas to test the state machine in TreeTransform, apart from @cor3ntin's request.

Moreover, you may need to build LLDB locally and check if we're missing anything else (e.g. handling newly added expressions/decls) there.

https://github.com/llvm/llvm-project/pull/121417