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Simplify handling of "define box by compositing" (#2420)
When there is a "define box by compositing", in principle, we should be indexing into the _imagined_ partitioned IterDomain, as shown below" ![](https://raw.githubusercontent.com/NVIDIA/Fuser/main/doc/dev/tma/box-by-compositing.svg) However, we were not able to do that in the past because indexing only supports backward propagation. With `TensorIndexer` and `AbstractTensor`, we can easily create the _imagined_ partitioned ValGroup and index into it. So there is no need to use the state machine approach to manually combine indices, instead, the index of the _imagined_ partitioned ValGroup can be directly used as the index for the TMA PTX instructions.
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