[mlir][vector] add ApplyReorderMultiReductionDimsPatternsOp tests (#180977) With the new finer grained populate methods introduced in 8dde3051504cb9ae42e654bbce39001f3946beea (#180750), there was a discussion about refactoring tests such that only one of the patterns applies at a time. This commit starts this process by adding the structure for one of these populate methods. The goal is for the populate methods to have their own file (each showing inner and outer reduction); deprecating populateVectorMultiReductionLoweringPatterns and ApplyLowerMultiReduction; and removing the test file for mlir/test/Dialect/Vector/vector-multi-reduction-lowering.mlir Essentially an NFC. It also adds a new transform op for testing the dialect and which downstream projects may choose to use. Assisted-By: claude-4.5-sonnet
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