Fix `minimize_register_usage` objective #127

Job	Run time
examples_basic	21s
examples_ntt_kyber_dilithium_helium_core	2m 14s
examples_ntt_kyber_dilithium_neon_core	22m 15s
examples_dry_run	59m 56s
fft	6m 14s
sqmag	34s
tutorial	39m 16s
	2h 10m 50s

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