Implement Write Barrier and dsize for FFI::Function#1003
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Ref: ffi#991 Write barrier protected objects are allowed to be promoted to the old generation, which means they only get marked on major GC. The downside is that the RB_BJ_WRITE macro MUST be used to set references, otherwise the referenced object may be garbaged collected. This commit also implement a `dsize` function so that these instance report a more relevant size in various memory profilers. It's not counting everything because some types are opaque right now, so a larger refactoring would be needed.
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Ref: #991
Write barrier protected objects are allowed to be promoted to the old generation,
which means they only get marked on major GC.
The downside is that the RB_BJ_WRITE macro MUST be used to set references,
otherwise the referenced object may be garbaged collected.
This commit also implement a
dsizefunction so that these instance reporta more relevant size in various memory profilers. It's not counting everything
because some types are opaque right now, so a larger refactoring would be needed.