[llvm] [LowerMemIntrinsics] Factor control flow generation out of the memcpy lowering (PR #169039)

[Fabian Ritter via llvm-commits]

ritter-x2a wrote:

* **#169040** <a href="https://app.graphite.com/github/pr/llvm/llvm-project/169040?utm_source=stack-comment-icon" target="_blank"><img src="https://static.graphite.dev/graphite-32x32-black.png" alt="Graphite" width="10px" height="10px"/></a>
* **#169039** <a href="https://app.graphite.com/github/pr/llvm/llvm-project/169039?utm_source=stack-comment-icon" target="_blank"><img src="https://static.graphite.dev/graphite-32x32-black.png" alt="Graphite" width="10px" height="10px"/></a> 👈 <a href="https://app.graphite.com/github/pr/llvm/llvm-project/169039?utm_source=stack-comment-view-in-graphite" target="_blank">(View in Graphite)</a>
* `main`


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https://github.com/llvm/llvm-project/pull/169039