[MLIR][XeGPU] Enhance Layout Propagation for broadcasting both leading dimensions and inner unit dimensions (#185583) This PR enhances the layout propagation rules for broadcast operations. The source layout is derived from the result layout based on the broadcast pattern: 1. Broadcast on leading dimensions The source layout is the slice layout of the result layout. 2. Broadcast on inner unit dimensions The source layout matches the result layout, with sg_data and lane_data set to 1. 3. Broadcast on both leading dimensions and inner unit dimensions The source layout is derived by combining the above two rules.
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