ZJIT: Remove rb_zjit_writebarrier_check_immediate #256

Job	Run time
ruby-bench (--zjit-call-threshold=2, --warmup=1 --bench=1 --excludes=shipit, --enable-zjit=dev_no...	20m 56s
cargo clippy	43s
make (check, --zjit-disable-hir-opt --zjit-call-threshold=1, -T --zjit-disable-hir-opt -T --zjit-...	17m 43s
make (test-bundled-gems, --enable-zjit=dev, --zjit-call-threshold=1)	22m 25s
make (check, --zjit-call-threshold=1, -T --zjit-call-threshold=1, --enable-zjit=dev)	26m 41s
make (zjit-bindgen, To fix: use patch in logs, --enable-zjit=dev --enable-yjit --with-gcc=clang-1...	4m 57s
make (zjit-check, --enable-yjit --enable-zjit=dev, 1.85.0)	5m 1s
make (btest, --zjit-call-threshold=2, --enable-zjit=dev)	5m 29s
ZJIT Ubuntu result	3s
	1h 43m 58s

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