Enable use_subwarp_shuffle=True for CTA kernel on ROCm#5917
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Summary: Instantiate the CTA backward kernel template with `use_subwarp_shuffle=True` on ROCm, enabling subwarp shuffle-based reductions instead of shared memory reductions. The warp kernel template is unchanged (`use_subwarp_shuffle=False`). This is a CTA-only change. Differential Revision: D108830772
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Summary: Instantiate the CTA backward kernel template with
use_subwarp_shuffle=Trueon ROCm, enabling subwarp shuffle-based reductions instead of shared memory reductions. The warp kernel template is unchanged (use_subwarp_shuffle=False). This is a CTA-only change.Differential Revision: D108830772