[clang] [llvm] [Coroutines] Mark parameter allocas with coro.outside.frame metadata (PR #127653)

[Erik Jensen via cfe-commits]

rkjnsn wrote:

Even for a real suspend, though, isn't it still possible for the coroutine to be resumed on a different thread, completed, and the frame deleted, all before the coroutine ramp finishes executing on the current thread?

https://github.com/llvm/llvm-project/pull/127653