[mlir][Linalg] Make contraction vectorization use vector transfers

[nicolasvasilache]

Summary

This revision replaces the load + vector.type_cast by appropriate vector transfer
operations. These play more nicely with other vector abstractions and canonicalization
patterns and lower to load/store with or without masks when appropriate.

[ftynse]

mlir/test/Dialect/Linalg/transform-patterns.mlir

2

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[nicolasvasilache]

Fix test.

[nicolasvasilache]

mlir/test/Dialect/Linalg/transform-patterns.mlir

2

sorry, had forgotten to updated, the syntax was wrong and I was debugging.

Thanks!