[llvm] [CoroEarly][IR] Clarify semantic of llvm.coro.end (PR #191752)

[Weibo He via llvm-commits]

NewSigma wrote:

> Could you clarify why now the promise will be assumed to be escaping?

In the declaration of `llvm.coro.id`, the promise parameter does not have `nocapture` attribute. As a result, passes will assume that the promise pointer may be captured.

https://github.com/llvm/llvm-project/pull/191752