[quidditch_snitch] Add start_zero_mem_transfer operation
#113
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This operation is a special kind of DMA transfer leveraging both Snitch's DMA and a special address space in the cluster's memory that always returns 0. This allows zeroing memory in bursts of 64kB using the DMA. While currently unused in the pipeline, the operation will be used soon to implement a lowering of `tensor.pad`. Occurrences of `linalg.fill` with zero can also be optimized in the future.
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This operation is a special kind of DMA transfer leveraging both Snitch's DMA and a special address space in the cluster's memory that always returns 0. This allows zeroing memory in bursts of 64kB using the DMA.
While currently unused in the pipeline, the operation will be used soon to implement a lowering of
tensor.pad. Occurrences oflinalg.fillwith zero can also be optimized in the future.