Show chain of references for unshareable class variables #9651

Job	Run time
cargo clippy	36s
make (test-bundled-gems, --enable-yjit=dev)	14m 31s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	15m 32s
cargo test	59s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-14 --enable-yjit=dev --enable-zji...	5m 4s
make (check, --enable-yjit=dev)	13m 18s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	8m 48s
YJIT Ubuntu result	3s
	58m 51s

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