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* [Bugfix] Adjust role assignment in warp specialization based on read access

- Updated the role assignment logic in `warp_specialized_rewriter.cc` to set the role to `kConsumer` when no reads are detected, ensuring correct behavior in memory access scenarios.

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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Co-authored-by: Lei Wang <34334180+LeiWang1999@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>