Merge branch 'upstream' into concedo_experimental

# Conflicts:
#	ggml/src/ggml-opencl/ggml-opencl.cpp
#	ggml/src/ggml-sycl/ggml-sycl.cpp
#	requirements/requirements-convert_hf_to_gguf_update.txt
#	scripts/compare-llama-bench.py
#	tests/test-backend-ops.cpp
#	tests/test-chat.cpp
#	tools/imatrix/README.md
#	tools/imatrix/imatrix.cpp
#	tools/llama-bench/llama-bench.cpp

common/common.h

@@ -435,6 +435,7 @@ struct common_params {
     int32_t n_out_freq  = 10; // output the imatrix every n_out_freq iterations
     int32_t n_save_freq =  0; // save the imatrix every n_save_freq iterations
     int32_t i_chunk     =  0; // start processing from this chunk
+    bool    imat_dat    = false; // whether the legacy imatrix.dat format should be output
 
     bool process_output  = false; // collect data for the output tensor
     bool compute_ppl     = true;  // whether to compute perplexity