Rework tests for rnglists and loclists #538

Job	Run time
bench	1m 14s
Build fuzz targets	1m 6s
coverage	1m 5s
build (ubuntu-latest, stable)	40s
cross (i686-unknown-linux-gnu)	47s
build (ubuntu-latest, beta)	43s
doc	25s
cross (powerpc64-unknown-linux-gnu)	50s
features	3m 7s
build (ubuntu-latest, nightly)	42s
build (stable, macOS-latest)	35s
msrv	3m 2s
msrv-read	2m 56s
rustfmt	9s
Run `debug_abbrev` fuzz target	5m 6s
Run `debug_aranges` fuzz target	5m 5s
Run `debug_info` fuzz target	5m 10s
Run `debug_line` fuzz target	5m 5s
Run `eh_frame` fuzz target	5m 10s
Run `eh_frame_hdr` fuzz target	5m 9s
	48m 6s

Provide feedback