feat: avoid unnecessary ssa passes while loop unrolling #15175

Job	Run time
build-nargo	2m 17s
build-acvm-js	1m 24s
build-noirc-abi	1m 26s
build-noir-wasm	3m 51s
ACVM JS (Node.js)	41s
ACVM JS (Browser)	1m 20s
noirc_abi	1m 50s
Example scripts	18s
Noir JS	1m 6s
noir_codegen	1m 2s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	2m 21s
Integration Tests (Node)	2m 46s
noir_wasm	2m 14s
End	1s
	22m 37s

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