[llvm] [DSE] Defer alloca store elimination for CoroSplit (PR #133918)

[Nikita Popov via llvm-commits]

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+; Test that store-load operation that crosses suspension point will not be eliminated by DSE before CoroSplit
+; RUN: opt < %s -passes='dse,verify' -S | FileCheck %s
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nikic wrote:

```suggestion
; RUN: opt < %s -passes=dse -S | FileCheck %s
```
verify is implicit.

https://github.com/llvm/llvm-project/pull/133918