chore: abstract away subtractions from `OR` implementation #1548

Job	Run time
build-nargo	2m 21s
build-acvm-js	3m 45s
build-noirc-abi	3m 26s
build-noir-wasm	5m 12s
noirc_abi	48s
noir-js-backend-barretenberg	45s
ACVM JS (Node.js)	40s
ACVM JS (Browser)	1m 39s
noir_codegen	55s
Noir JS	1m 34s
Integration Tests	8m 27s
noir_wasm	54s
End	1s
	30m 27s

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