ZJIT: Iterator for ISeq `opt_table` for quick one-off access #12816

Job	Run time
make (check, --enable-shared --enable-load-relative)	7m 56s
make (check, ubuntu-24.04, capi)	10m 41s
make (check, --disable-yjit)	7m 25s
make (test-bundler-parallel, 50)	21m 45s
make (test-bundled-gems)	13m 24s
make (check, i686)	11m 45s
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 42s
make (check, cppflags=-DVM_CHECK_MODE)	8m 42s
make-ibm	0s
Ubuntu result	2s
	1h 36m 22s

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