[llvm] [mlir] [IR] Forbid mixing condition and operand bundle assumes (PR #160460)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

> Currently, we also allow mixing both forms, though we don't make use of this in practice.

Could we verify that we don't ever emit this kind of pattern using llvm-opt-benchmark or something?

https://github.com/llvm/llvm-project/pull/160460