vulkan: change graph_compute to be async and enable get_tensor_async #17158
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This allows some additional CPU/GPU overlap for large pp workloads. Also seems to help a bit for token gen, maybe getting rid of a small bubble between graph_compute and get_tensor. Async set and copy functions seem to be very rarely used, so I didn't enable them because I didn't have a good way to test them. The async commands need to be ordered against each other, so put them all on the compute queue. The non-async commands still use the transfer queue. The fence for graph_compute/get_tensor_async is submitted and waited on in ggml_vk_synchronize.
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This allows some additional CPU/GPU overlap for large pp workloads. Also seems to help a bit for token gen, maybe getting rid of a small bubble between graph_compute and get_tensor.
Async set and copy functions seem to be very rarely used, so I didn't enable them because I didn't have a good way to test them.
The async commands need to be ordered against each other, so put them all on the compute queue. The non-async commands still use the transfer queue.
The fence for graph_compute/get_tensor_async is submitted and waited on in ggml_vk_synchronize.
See #17033 (comment).