Assembly conditional (`.if`) support #389

Job	Run time
examples_ntt_kyber_dilithium_helium_core	2m 20s
Dry Run (slothy.targets.arm_v81m.cortex_m55r1)	3m 16s
Dry Run (slothy.targets.arm_v81m.cortex_m85r1)	1m 57s
Dry Run (slothy.targets.aarch64.cortex_a55)	7m 31s
Dry Run (slothy.targets.aarch64.cortex_a72_frontend)	25m 56s
examples_ntt_kyber_dilithium_neon_core	21m 53s
Dry Run (slothy.targets.aarch64.apple_m1_firestorm_experimental)	21m 5s
examples_basic	22s
fft	6m 34s
Dry Run (slothy.targets.aarch64.apple_m1_icestorm_experimental)	17m 17s
sqmag	34s
tutorial	13m 24s
	2h 2m 9s

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