Avoid creation of temporary protobuf object #7863

Job	Run time
precheck	1m 45s
wasm_Debug / build-wasm	53m 2s
wasm_Release / build-wasm	57m 38s
wasm_Release_static_library / build-wasm	7m 49s
web_Debug / build_onnxruntime_web	18m 18s
web_Release / build_onnxruntime_web	23m 9s
	2h 41m 41s

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