The current fusion on tensors fuses reshape ops with generic ops by
linearizing the indexing maps of the fused tensor in the generic
op. This has some limitations
- It only works for static shapes
- The resulting indexing map has a linearization that would be potentially prevent fusion later on (for ex. tile + fuse).
Instead, try to fuse the reshape consumer (producer) with generic op
producer (consumer) by expanding the dimensionality of the generic op
when the reshape is expanding (folding).
This approach conflicts with the linearization approach. The use of
the linearization approach is still kept as the default, but the
approach added in this change will be made the default after further