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This PR adds a new smaller 64-column tile fast path for sorted nvfp4 gather_qmm to improve performance for models with expert widths that are divisible by 64 but not by 128.
Tested with mlx-lm p2048/g128 using the mlx-community/gemma-4-26b-a4b-it-nvfp4
and mlx-community/NVIDIA-Nemotron-3-Nano-30B-A3B-NVFP4