[mlir][nvgpu] Improve `tensormap.descriptor` Type Verifier (#77904) This PR improves the verifier for the `nvgpu.tensormap.descriptor` type. The descriptor contains information for TMA, and the compile-time check ensures its restrictions, such as the last memory dimension being 128-byte. This prevents runtime crashes. See cuda driver for more explanation: https://docs.nvidia.com/cuda/cuda-driver-api/group__CUDA__TENSOR__MEMORY.html#group__CUDA__TENSOR__MEMORY_1ga7c7d2aaac9e49294304e755e6f341d7
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