[llvm] [DRAFT] coros: suspend metadata preservation (PR #150077)

[Christian Ulmann via llvm-commits]

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+; Tests that coro-split pass preserves metadata on suspend points.
+; RUN: opt < %s -coro-split-preserves-suspend-md -passes='cgscc(coro-split),simplifycfg,early-cse' -S | FileCheck %s
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Dinistro wrote:

```suggestion
; RUN: opt %s -coro-split-preserves-suspend-md -passes='cgscc(coro-split)' -S | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/150077