internal: Support builtin derive macro helper attributes #13730
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Macro2's generally don't have derive helpers, but currently builtin derive macros are declared with macro2 syntax, which can have derive helpers.
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Closes #13244
It's a bit wasteful for
Macro2Datato havehelpersfield currently just forDefaultderive macro, but I tend to think it's okay for the time being given how rare macro2's are used.