[llvm] [coroutines][CoroSplit] Store allocas on the frame if there is no exp… …licit lifetime.end (PR #88806)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

Also:

- If there's a lifetime.start, and it flows to a ret/unreachable/resume, treat it as if there's a lifetime.end just before that.

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llvm/lib/CodeGen/StackColoring.cpp implements this analysis, but not in a way you can easily reuse.  Still probably a useful reference.

(Lifetime intrinstics are inherently pretty messy; see also #45725.)

https://github.com/llvm/llvm-project/pull/88806