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* `RB_OBJ_SET_SHAREABLE(obj)` makes obj shareable. All of reachable objects from `obj` should be shareable. * `RB_OBJ_SET_FROZEN_SHAREABLE(obj)` same as above but freeze `obj` before making it shareable. Also `rb_gc_verify_shareable(obj)` is introduced to check the `obj` does not violate shareable rule (an shareable object only refers shareable objects) strictly. The rule has some exceptions (some shareable objects can refer to unshareable objects, such as a Ractor object (which is a shareable object) can refer to the Ractor local objects. To handle such case, `check_shareable` flag is also introduced. `STRICT_VERIFY_SHAREABLE` macro is also introduced to verify the strict shareable rule at `SET_SHAREABLE`.