fix: prevent compiler panic when popping from empty slices #14102

Job	Run time
build-acvm-js	1m 23s
build-noir-wasm	3m 39s
build-noirc-abi	1m 29s
build-nargo	2m 18s
ACVM JS (Node.js)	36s
ACVM JS (Browser)	1m 43s
noirc_abi	1m 41s
Noir JS	1m 18s
noir_codegen	1m 8s
Example scripts	10s
Check external repo - ${{ matrix.project.repo }}	0s
Integration Tests (Browser)	2m 0s
noir_wasm	1m 31s
Integration Tests (Node)	2m 8s
End	1s
	21m 5s

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