[MLIR][XeGPU] XeVM lowering support for load_matrix/store_matrix (#162780) This PR adds lowering of xegpu.load_matrix/store_matrix to xevm.blockload/blockstore or and llvm.load/store, depending on wi level attributes. It includes a few components: 1. adds wi-level attributes: subgroup_block_io. 2. expand load_matrix/store_matrix op definition to support scalar data (besides vector data). 2. adds a member function to mem_desc to compute the linearized address for a nd offsets. 3. add lowering depending on wi-level attributes: a) if subgroup_block_io attribute presents, lower to xevm.blockload/blockstore c) else lower to llvm.load/store. If result is a vector, lower to llvm.load/store with vector operand.
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