[mlir][TilingInterface] Allow tile and fuse to work with `ReductionTilingStrategy::PartialReductionOuterParallelStrategy`. (#147593) Since `scf::tileUsingSCF` is the core method used for tiling the root operation within the `scf::tileConsumersAndFuseProducersUsingSCF`, the latter can fuse into any tiled loop generated using `scf::tileUsingSCF`. This patch adds a test for tiling a root operation using `ReductionTilingStrategy::PartialReductionOuterParallelStrategy` and fusing producers with it. Since this strategy generates a rank-reducing extract slice `tensor::replaceExtractSliceWithTiledProducer` which is the core method used for the fusion was extended to handle the rank-reducing slices. Also fix a small bug in the computation of the reduction induction variable (which needs to use `floorDiv` instead of `ceilDiv`) Signed-off-by: MaheshRavishankar <mahesh.ravishankar@gmail.com>
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