[llvm] Coroutines: Cleanup typed pointer code in CoroFrame.cpp (PR #67141)

[Chuanqi Xu via llvm-commits]

https://github.com/ChuanqiXu9 approved this pull request.

LGTM. Thanks. Please add a `[NFC]` marker in the title of the commit when pushing it.

https://github.com/llvm/llvm-project/pull/67141