[mlir][vector] Update tests for collapse 2/n (nfc) (#94604)
The main goal of this PR (and subsequent PRs), is to add more tests with
scalable vectors to:
* vector-transfer-collapse-inner-most-dims.mlir
Changes in this PR:
1. Renamed `@contiguous_inner_most_dim_bounds` as
`@contiguous_inner_most_dim_with_subview`. This test was introduced
to make sure that the `in_bounds` attribute is correctly preserved,
but that's already verified by some earlier tests. The updated name
highlights the differentiating factor of this test when compared to
the other tests _currently_ present in the file, i.e. the presence of
`memref.subview` in the input IR.
2. Renamed `@contiguous_inner_most_dim_out_of_bounds_2d` as
`@negative_non_unit_inner_vec_dim`. While this test does contain an
out-of-bounds access, the actual reason for the tested pattern to
fail is the fact that the inner dim in the output vector is not "1".
A complimentary test was added to verify that the pattern also fails
when the source memref has non-unit trailing dim
(`@negative_non_unit_inner_memref_dim`).
3. Renamed `@contiguous_inner_most_dim` as
`@contiguous_inner_most_dim_non_zero_idxs` - this test verifies that
the pattern works in the presence of non-zero idxs.
4. Added more tests for scalable vectors - this should cover all cases
for `vector.transfer_read`.
NOTE: This PR is limited to tests for `vector.transfer_read`.
Follow-up for: #94490
llvm-project
b83f8c75 - [mlir][vector] Update tests for collapse 2/n (nfc) (#94604)
