Exposes the `tensor.extract_slice` reshaping logic in
`BubbleUpExpandShapeThroughExtractSlice` and
`BubbleUpCollapseShapeThroughExtractSlice` through two corresponding
utility functions. These compute the offsets/sizes/strides of an extract
slice after either collapsing or expanding.
This should also make it easier to implement the two other bubbling
cases: (1) the `collapse_shape` is a consumer or (2) the `expand_shape`
is a consumer.
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Signed-off-by: Ian Wood <ianwood@u.northwestern.edu>
961b052e98