[clang] [llvm] [Coroutines] Replace struct alloca frame with byte array and ptradd (PR #178359)

[Weibo He via llvm-commits]

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NewSigma wrote:

`optnone` generates many outputs. I wonder if it's better to use handwritten tests and skip updating coro-split-sink-lifetime-0[2-4].ll if it's not necessary.

https://github.com/llvm/llvm-project/pull/178359