[clang] [llvm] [clang][CodeGen] Extends lifetime of coroutine promise(CWG2563) (PR #151067)

[Weibo He via llvm-commits]

NewSigma wrote:

> then why do we change the lowering of coro.end conditionally? I mean, if it is good, it will be better and simpler to do it unconditionally.

It is reasonable. I will use a new intrinsic instead of lower `coro.end` conditionally.

https://github.com/llvm/llvm-project/pull/151067