Apple

Fix data race on should_stop_ flag in LLM runner (#18652) #19988

Job	Run time
set-version	9s
build-benchmark-app / macos-job	58m 27s
build-demo-ios / macos-job	44m 13s
build-frameworks-ios / macos-job	59m 3s
upload-demo-ios	44s
test-demo-ios / mobile-job (ios)	16m 47s
upload-frameworks-ios	50s
	3h 0m 13s

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