[Mosaic TPU] Support memref bitcast. #23263
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If element bitwidth changes, the ratio of bitwidth is multiplied to the 2nd minormost dim size and the leading dim in tiling. For example, we can bitcast Memref<8x128xf32> with tiling (8, 128) to Memref<16x128xi16> with tiling (16, 128). PiperOrigin-RevId: 668619683
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[Mosaic TPU] Support memref bitcast.
If element bitwidth changes, the ratio of bitwidth is multiplied to the 2nd minormost dim size and the leading dim in tiling. For example, we can bitcast Memref<8x128xf32> with tiling (8, 128) to Memref<16x128xi16> with tiling (16, 128).