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[MLIR][Shape] Lower `shape.get_extent` to `std.dim` when possible

Authored by frgossen on Jun 26 2020, 5:03 AM.



When the shape is derived from a tensor argument the shape extent can be derived
directly from that tensor with std.dim.
This lowering pattern circumvents the necessity to materialize the shape in

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frgossen created this revision.Jun 26 2020, 5:03 AM
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This revision is now accepted and ready to land.Jun 26 2020, 5:13 AM
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