[llvm] [coro][CoroSplit] Use `llvm.lifetime.end` to compute putting objects on the frame vs the stack (PR #90265)

[Alan Zhao via llvm-commits]

alanzhao1 wrote:

not sure why buildkite is failing - I didn't see any test failures and `ninja check-llvm` passed locally for me on Linux.

https://github.com/llvm/llvm-project/pull/90265