[llvm] [SelectionDAG] Fix missed optimization for CLMUL where one operand is all ones (PR #200592)

[Jan Schultke via llvm-commits]

eisenwave wrote:

> @eisenwave please can you merge/rebase against trunk? I've added the clmul-vector.ll tests at #201321 - it looks to have been a conflict in the shared check-prefixes

Yeah sure, but I'm getting the impression it will take a few more dozen or hundred tries to get a green build ...

```
026-06-03T14:38:39.5668704Z ********************
2026-06-03T14:38:39.5668930Z Failed Tests (1):
2026-06-03T14:38:39.5669176Z   Clang :: Driver/hipspv-toolchain.hip
```



https://github.com/llvm/llvm-project/pull/200592