[CPU] Support chunk_gated_delta_rule kernel for Qwen3-Next

[Valentine233]

Motivation

This PR adds chunk_gated_delta_rule kernel for Qwen3-next.

Test Plan:
test/srt/cpu/test_mamba.py -k test_chunk_gated_delta_rule

Modifications

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.

[gemini-code-assist]

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[mingfeima]

let's finish the minor issues first and then dig into performance related staff.

[mingfeima]

@Valentine233 how much does this kernel contribute in e2e benchmarks right now?

[Valentine233]

@Valentine233 how much does this kernel contribute in e2e benchmarks right now?

This kernel is about 13.67% of e2e, for Qwen3-Next prefill phase with BS=1, 1k length, TP=2 on GNR.

[mingfeima]

we can continue simplify the code a little bit.

[mingfeima]

@Valentine233 need to update https://github.com/sgl-project/sglang/blob/main/test/srt/run_suite.py#L493-L510 to make CI really launch the test.

[mingfeima]

@Valentine233 update this check util according this #12324 (comment)

[mingfeima]

LGTM

[mingfeima]

fix CI fails.

[FlamingoPg]

@Valentine233 Hi, could you plz fix lint? I will help you merge this PR.

[Valentine233]

Thanks @FlamingoPg, the previous lint issue has been fixed. The current lint issue is not related to the PR: test/srt/test_priority_scheduling.py.

[Valentine233]

Hi @FlamingoPg, I have rebased again. There is no related CI issue now.

[FlamingoPg]

LGTM