b12397

cuda : keep columns in registers for cooperative softmax (#28982)

Template soft_max_f32_parallelize_cols_single_row to keep column
elements in registers when they fit, reducing memory traffic from
5 global memory passes to 2 passes.

Assisted-by: Gemini 3.8 Flash

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/67720591

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