feat(ssa): Unroll small loops in brillig #15223

Job	Run time
build-acvm-js	1m 28s
build-nargo	2m 23s
build-noirc-abi	1m 27s
build-noir-wasm	3m 40s
noirc_abi	1m 18s
ACVM JS (Browser)	2m 12s
ACVM JS (Node.js)	45s
noir_codegen	1m 2s
Noir JS	1m 13s
Example scripts	10s
Check external repo - ${{ matrix.project.repo }}	0s
noir_wasm	2m 26s
Integration Tests (Browser)	1m 49s
Integration Tests (Node)	2m 18s
End	1s
	22m 12s

Provide feedback