fix: Fix brillig slowdown when assigning arrays in loops #4483

Job	Run time
build-acvm-js	2m 14s
build-nargo	2m 20s
build-noirc-abi	2m 29s
build-noir-wasm	3m 53s
ACVM JS (Browser)	1m 7s
ACVM JS (Node.js)	32s
noir_codegen	1m 3s
noirc_abi	50s
noir-js-backend-barretenberg	45s
Noir JS	1m 23s
noir_wasm	1m 20s
Integration Tests (Node)	3m 39s
Integration Tests (Browser)	5m 4s
End	1s
	26m 40s

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