Rust

Add UnitRef::shared_attrs #552

Job	Run time
coverage	1m 9s
bench	1m 9s
build (ubuntu-latest, stable)	44s
build (ubuntu-latest, beta)	44s
Build fuzz targets	1m 8s
build (ubuntu-latest, nightly)	40s
cross (i686-unknown-linux-gnu)	46s
doc	25s
cross (powerpc64-unknown-linux-gnu)	53s
build (stable, macOS-latest)	38s
features	2m 56s
msrv	1m 50s
msrv-read	1m 51s
rustfmt	11s
Run `debug_abbrev` fuzz target	5m 11s
Run `debug_aranges` fuzz target	5m 13s
Run `debug_info` fuzz target	5m 6s
Run `debug_line` fuzz target	5m 10s
Run `eh_frame` fuzz target	5m 5s
Run `eh_frame_hdr` fuzz target	5m 6s
	45m 55s

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