[Memory-layout infra] Create common permute-count test suite
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@AdrianLundell is already working on this.
Since Jun 17, 2026.
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Description
Part of #19299. To give a solid baseline for the permute fusion we will need a test suite for evaluating the algorithm over a wide set of model architectures. The tests should count the number of permutes before and after running ToContiguousChannelsLastPss + any permute fusing passes and ensure numerical equivalence.
A good starting point would be https://github.com/pytorch/executorch/blob/main/backends/arm/test/misc/test_transpose_counts.py, however it should be extended with a number of representative full networks and any other sub-graphs known to lead to difficulties when doing permute-fusions.
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