fix(experimental elaborator): Fix panic in the elaborator #7331

Job	Run time
build-acvm-js	1m 25s
build-nargo	2m 20s
build-noirc-abi	2m 8s
build-noir-wasm	4m 1s
ACVM JS (Node.js)	44s
ACVM JS (Browser)	1m 19s
noir-js-backend-barretenberg	43s
noirc_abi	1m 11s
Noir JS	1m 41s
Example scripts	10s
noir_codegen	59s
Integration Tests (Browser)	2m 11s
Integration Tests (Node)	1m 35s
noir_wasm	1m 48s
End	1s
	22m 16s

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