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cbd72cb0de
Splits `TransposeOpLowering` into two patterns:
1. `Transpose2DWithUnitDimToShapeCast` - rewrites 2D `vector.transpose`
as `vector.shape_cast` (there has to be at least one unit dim),
2. `TransposeOpLowering` - the original pattern without the part
extracted into `Transpose2DWithUnitDimToShapeCast`.
The rationale behind the split:
* the output generated by `Transpose2DWithUnitDimToShapeCast` doesn't
really match the intended output from `TransposeOpLowering` as
documented in the source file - it doesn't make much sense to keep
it embedded inside `TransposeOpLowering`,
* `Transpose2DWithUnitDimToShapeCast` _does_ work for scalable vectors,
`TransposeOpLowering` _does_ not.