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Preserve usable slot size when RVALUE_OVERHEAD is non-zero #96

Job	Run time
ruby-bench (--zjit-call-threshold=2, --warmup=1 --bench=1 --excludes=shipit, --enable-zjit=dev_no...	15m 41s
cargo clippy	45s
make (btest, --zjit-call-threshold=2, --enable-zjit=dev)	5m 23s
make (check, --zjit-disable-hir-opt --zjit-call-threshold=1, -T --zjit-disable-hir-opt -T --zjit-...	14m 24s
make (zjit-bindgen, To fix: use patch in logs, --enable-zjit=dev --enable-yjit --with-gcc=clang-1...	5m 31s
make (zjit-check, --enable-yjit --enable-zjit=dev, 1.85.0)	5m 37s
make (check, --zjit-call-threshold=1, -T --zjit-call-threshold=1, --enable-zjit=dev)	14m 24s
make (test-bundled-gems, --enable-zjit=dev, --zjit-call-threshold=1)	13m 18s
ZJIT Ubuntu result	3s
	1h 15m 6s