[BUG] seq_v unusued, but set causing complaints in upstream PyTorch compilation

[Skylion007]

Describe the bug
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build trace:
https://hud.pytorch.org/pr/pytorch/pytorch/131493#32406967080

Steps/Code to reproduce bug
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• try to compile @eqy's PR here [CUDA][CUTLASS][submodule] Fixes for CUTLASS upgrade pytorch/pytorch#131493 . Compilation throws errors due to unused variables. [maybe_unused] or removing them could be used to fix them.

Expected behavior
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CUTLASS does not cause errors in downstream projects due to unused variables.

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• Environment location: [Bare-metal, Docker, Cloud(specify cloud provider)]

Additional context
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