[BugFix] fix Ascend310P3 error

[HF-001]

What this PR does / why we need it?

fix ci error: Cannot find option named 'Ascend310P3'. The issues introduced by this PR's modifications： #7756

• vLLM version:
• vLLM main: https://github.com/vllm-project/vllm/commit/v0.19.0

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a CI failure related to the Ascend310P3 hardware target. By introducing a hardware-specific check, the system now correctly bypasses unsupported Triton kernel compilation for this architecture, defaulting to the appropriate PyTorch fallback path to maintain stability.

Highlights

• Ascend310P3 Compatibility: Updated the Triton kernel execution logic to explicitly check for Ascend310P hardware.
• Fallback Mechanism: Ensured that the PyTorch fallback path is utilized for Ascend310P3, as it does not support Triton kernel compilation.

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[github-actions]

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[gemini-code-assist]

Code Review

This pull request introduces a check for Ascend 310P hardware in the GDN chunk meta operations. It bypasses Triton kernel compilation on this specific hardware because the compiler does not currently support it, opting instead for a PyTorch-based fallback path. The review feedback correctly identifies that the PR title and summary do not adhere to the repository's style guide and provides a compliant template.

[gemini-code-assist]

Suggested PR Title:

[Ops][BugFix] Fix Ascend310P3 Triton compilation error in GDN chunk meta

Suggested PR Summary:

### What this PR does / why we need it?

This PR bypasses Triton kernel compilation for the `_build_final_chunk_indices` operation on Ascend 310P3 hardware. Since `bishengir-compile` does not currently support targeting Ascend 310P3, attempting to compile Triton kernels results in a CI error: `Cannot find option named 'Ascend310P3'`. A PyTorch-based fallback implementation is used instead.

Fixes #7756

### Does this PR introduce _any_ user-facing change?

No. This is a backend-specific fix for Ascend 310P3 hardware compatibility.

### How was this patch tested?

Verified that the logic correctly falls back to the PyTorch implementation when `is_310p()` is true, avoiding the Triton compilation error in CI.

This PR does not follow the Repository Style Guide for PR Title and Summary format. Please update the PR title and description accordingly.

References

1. The PR title and summary must follow a specific format including [Branch][Module][Action] prefixes and a structured summary body. ^(link)

[HF-001]

@wangxiyuan hi，this pr is ready， Would it be convenient for you to take a look?