feat: simplify multiplications by `0` or `1` in ACIR gen #1528

Job	Run time
build-nargo	2m 25s
build-noir-wasm	5m 16s
build-noirc-abi	4m 13s
build-acvm-js	3m 38s
ACVM JS (Node.js)	33s
ACVM JS (Browser)	1m 3s
noir_codegen	1m 3s
noirc_abi	52s
Noir JS	1m 38s
noir-js-backend-barretenberg	42s
Integration Tests	8m 29s
noir_wasm	59s
End	1s
	30m 52s

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