fix: Fix poor handling of aliased references in flattening pass causi… #92

Job	Run time
build-nargo	2m 25s
build-noirc-abi	1m 43s
build-acvm-js	1m 37s
build-noir-wasm	3m 49s
ACVM JS (Node.js)	44s
ACVM JS (Browser)	2m 13s
noirc_abi	1m 17s
Example scripts	16s
Noir JS	1m 10s
noir_codegen	1m 1s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	2m 15s
noir_wasm	1m 35s
Integration Tests (Node)	2m 22s
End	1s
	22m 28s

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