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Unshare arrays only when they become shareable #689

Job	Run time
cargo clippy	34s
cargo test	1m 17s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-14 --enable-yjit=dev --enable-zji...	4m 25s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	12m 46s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	10m 26s
make (check, --enable-yjit=dev)	15m 36s
make (test-bundled-gems, --enable-yjit=dev)	11m 56s
YJIT Ubuntu result	2s
	57m 2s