[mlir][vector] Update tests for collapse 1/n (nfc) (#94490)
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
There's quite a few cases to consider, hence this is split into multiple
PRs. In this PR, the very first test is complemented with all the
possible combinations:
* scalable (rather than fixed) unit trailing dim,
* dynamic (rather than static) trailing dim in the source memref.
Also,
* `@leading_scalable_dimension_transfer_read` and
`@trailing_scalable_one_dim_transfer_read`,
are replaced with:
* `@contiguous_inner_most_scalable_inner_dim` and
`@negative_scalable_unit_dim`,
respectively, and added to the list above (i.e. alongside other
variations for the very first test).
In addition:
* "_view" is removed from function names (it's not clear to me what it
was meant to signify)
* extra comments are added to separate tests for vector.transfer_read
and vector.transfer_write
NOTE: This PR is limited to tests for `vector.transfer_read`.
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