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* vulkan: Add fusion support for RMS_NORM+MUL - Add a use_count to ggml_tensor, so we can detect if an output is used more than once. - Change the ggml-vulkan rms_norm shader to optionally multiply by another tensor. - Add detection logic and basic fusion logic in ggml-vulkan. - Add some testing support for fusion. Rather than computing one node at a time, allow for computing the whole graph and just testing one node's results. Add rms_norm_mul tests and enable a llama test. * extract some common fusion logic * fix -Winconsistent-missing-override * move ggml_can_fuse to a common function * build fix * C and C++ versions of can_fuse * move use count to the graph to avoid data races and double increments when used in multiple threads * use hash table lookup to find node index * change use_counts to be indexed by hash table slot * minimize hash lookups style fixes * last node doesn't need single use. fix type. handle mul operands being swapped. * remove redundant parameter --------- Co-authored-by: slaren <slarengh@gmail.com>