YJIT: implement cache for recently encoded/decoded contexts (#10938) #524

Job	Run time
cargo test	46s
cargo clippy	30s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-12 --enable-yjit=dev)	4m 21s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	8m 13s
make (check, --enable-yjit=dev)	14m 50s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	41m 14s
make (test-bundled-gems, --enable-yjit=dev)	21m 46s
make (yjit-bench, --enable-yjit=dev, --yjit-stats, true)	5m 20s
YJIT Ubuntu result	1s
	1h 37m 1s

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