ZJIT: Read `iseq->body->param` directly instead of through FFI

Going through a call to a C function just to read a bitfield was a
little extreme. We did it to be super conservative since bitfields
have historically been the trigger of many bugs and surprises. Let's
try directly accessing them with code from rust-bindgen. If this
ends up causing issues, we can use the FFI approach behind nicer
wrappers.

In any case, directly access regular struct fields such as `lead_num`
and `opt_num` to remove boilerplate.

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