[Cherry-pick to release/v0.5.15] [DSA] Fix IMA in fused top-k v2: write all output slots on tie overflow (#30512) - #30559

[Cherry-pick to release/v0.5.15] [DSA] Fix IMA in fused top-k v2: write all output slots on tie overflow (#30512)#30559

Fridge003 merged 1 commit into

release/v0.5.15sgl-project/sglang:release/v0.5.15from

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