Add masked_index_benchmark #5583

Job	Run time
generate-matrix / generate	3s
pytorch/FBGEMM / manywheel-py3_9-cpu	19m 59s
pytorch/FBGEMM / manywheel-py3_9-cuda11_8	1h 15m 45s
pytorch/FBGEMM / manywheel-py3_9-cuda12_1	1h 48m 13s
pytorch/FBGEMM / manywheel-py3_9-cuda12_4	1h 42m 6s
pytorch/FBGEMM / manywheel-py3_9-rocm6_0	1h 44m 2s
pytorch/FBGEMM / manywheel-py3_9-rocm6_1	1h 39m 11s
pytorch/FBGEMM / upload / manywheel-py3_9-cpu	32s
pytorch/FBGEMM / upload / manywheel-py3_9-cuda11_8	37s
pytorch/FBGEMM / upload / manywheel-py3_9-cuda12_1	48s
pytorch/FBGEMM / upload / manywheel-py3_9-cuda12_4	47s
pytorch/FBGEMM / upload / manywheel-py3_9-rocm6_0	30s
pytorch/FBGEMM / upload / manywheel-py3_9-rocm6_1	32s
	8h 33m 5s

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