[llvm] [mlir] [mlir][Interfaces][NFC] Add TableGen test op for value bounds tests (PR #88717)

[Matthias Springer via llvm-commits]

matthias-springer wrote:

> I'd maybe make enums for the bound/comparator, though I think a `StrAttr` is fine for test ops.

I thought about that but many test cases would have to be updated because the syntax changes slightly.


https://github.com/llvm/llvm-project/pull/88717