[llvm] [InstCombine] Bail out on inner disjoint or in `foldSelectICmpEq` (PR #121635)

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goldsteinn wrote:

> Are you sure? Just looking at the tests, everything that folds seems to involve a `%c` value and the `== 0` tests are marked as TODOs.

err you're right, I was scanning for constants (although see now that code was dead!).

https://github.com/llvm/llvm-project/pull/121635