[minor] Improved repeat_kv eager perf
#251
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This PR:
aten::slice.aten::filland 4aten::copy_kernels with shape(bs, seq_len, n_kv_heads, head_dim).See pytorch/torchtitan#418 for details and traces.
Since this repo is hosting inference (forward-only) code, this change is not significant at all. However, since this repo also hosts the reference model implementation that others base on, even for training, this change could be helpful for others.