Error: Do not know how to split the result of this operator

When compiling upstream `sha2` crate in Rust with LLVM, I encountered this error which is reproducible with the latest version of llvm.

### Command to Reproduce
Artifact: [k.zip](https://github.com/user-attachments/files/24134450/k.zip)

```
llc k.ll -filetype=obj -o k.o
```

### Error
```
LLVM ERROR: Do not know how to split the result of this operator!
```

Download the attached k.zip artifact and reproduce the failure with `llc k.ll -filetype=obj -o k.o` while compiling the upstream `sha2` crate with LLVM. Start by examining the generated k.ll and the LLVM compilation path that reports the result-splitting error; done means the reproducer compiles without this LLVM error.

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