vulkan: support sparse Flash Attention - #28105
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On gfx1151 RADV the gather loses at every depth (11k -4.4, 115k -2.7 t/s vs masked, draft-mtp n-max 2): masked FA already skips fully-masked tiles, the per-block bias avoids the mask upload the gather exists to dodge, and gather mode forces the per-cell bias whose upload costs more than the gather saves. QWEN4EXP_QSA_GATHER=1 re-enables it for A/B. Revisit when Vulkan sparse FA (upstream ggml-org#28105) lands.
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Overview
Vulkan support for #27970
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