Enable SPIR-V compiler optimization (#4402) #2066

Job	Run time
build-llm-demo (bpe) / linux-job	29m 51s
build-llm-demo (tiktoken) / linux-job	33m 44s
upload-artifacts	1m 38s
run-emulator	7m 10s
test-llama-app (bpe) / mobile-job (android)	4m 32s
	1h 16m 55s

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