Slice the last matmull in stateful llm pipeline #2741

Job	Run time
cpp-beam_search_causal_lm-notus-7b-v1	7m 36s
cpp-beam_search_causal_lm-Phi-2	6m 20s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	8m 22s
cpp-beam_search_causal_lm-Qwen-7B-Chat	10m 53s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	12m 42s
cpp-chat_sample-ubuntu	11m 15s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	14m 27s
cpp-continuous-batching-macos	14m 57s
cpp-continuous-batching-ubuntu	12m 0s
cpp-continuous-batching-windows	18m 40s
cpp-greedy_causal_lm-redpajama-3b-chat	13m 4s
cpp-greedy_causal_lm-windows	17m 52s
cpp-multinomial-greedy_causal_lm-ubuntu	8m 20s
cpp-Phi-1_5	6m 14s
cpp-prompt_lookup_decoding_lm-ubuntu	10m 40s
cpp-speculative_decoding_lm-ubuntu	9m 36s
visual_language_chat_sample-ubuntu	11m 7s
ci/gha_overall_status_causal_lm	1s
	3h 14m 6s

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