Rework tests for rnglists and loclists (#751) #541

Job	Run time
msrv-read	3m 1s
build (ubuntu-latest, stable)	42s
build (ubuntu-latest, beta)	46s
Build fuzz targets	1m 6s
bench	1m 13s
build (ubuntu-latest, nightly)	41s
cross (i686-unknown-linux-gnu)	45s
build (stable, macOS-latest)	39s
cross (powerpc64-unknown-linux-gnu)	54s
features	3m 13s
msrv	3m 0s
rustfmt	6s
coverage	1m 9s
doc	21s
Run `debug_abbrev` fuzz target	5m 12s
Run `debug_aranges` fuzz target	5m 12s
Run `debug_info` fuzz target	5m 12s
Run `debug_line` fuzz target	5m 5s
Run `eh_frame` fuzz target	5m 10s
Run `eh_frame_hdr` fuzz target	5m 10s
	48m 37s

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