[mlir][memref] Fix rollback in test case during `convert-to-llvm` (#135958)

This commit is in preparation of the One-Shot Dialect Conversion
refactoring, which removes the rollback from the dialect conversion
framework.

`GenericAtomicRMWOpLowering` (`generic_atomic_rmw`) triggered a rollback
in two test cases. The lowering pattern adds additional basic blocks to
the enclosing operation, which used to be a `func.func` (now
`llvm.func`). Adding a basic block triggers legalization of the op that
owns the basic block. This fails when running
`--convert-to-llvm="filter-dialects=memref"` because no lowering
patterns for the `func` dialect were populated and only `llvm` ops are
considered "legal" by the `convert-to-llvm` pass, causing a rollback of
the entire `GenericAtomicRMWOpLowering` pattern.

Also add extra `CHECK-INTERFACE` to make sure that all test cases are
correctly lowered with `--convert-to-llvm="filter-dialects=memref"`.

0 files changed, 0 insertions, 0 deletions