Fix for Qwen3Next

A recent pull request to the llama.cpp repository proposes a fix for the vectorized calculation of key_gdiff in the Qwen3Next model. The initial report occurred on the Reddit platform, drawing attention to the need to refine the implementation.

The correction aims to improve the accuracy and efficiency of the model, a crucial aspect for the overall performance of llama.cpp. Specific implementation details are available in the project's GitHub repository.

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