[tor-bugs] #29209 [Core Tor/Tor]: Reduce visibility of more data type internals

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#29209: Reduce visibility of more data type internals
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 Reporter:  nickm                       |          Owner:  (none)
     Type:  task                        |         Status:  needs_review
 Priority:  Medium                      |      Milestone:  Tor:
                                        |  0.4.1.x-final
Component:  Core Tor/Tor                |        Version:
 Severity:  Normal                      |     Resolution:
 Keywords:  technical-debt refactoring  |  Actual Points:  3.5
Parent ID:                              |         Points:  15
 Reviewer:  nickm                       |        Sponsor:  Sponsor31-can
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Comment (by nickm):

 This strategy looks good!

 Also, let's change the identifier so that it's more clearly not reserved;
 I'm not sure that the `## _ ## _private` trick is actually any more legal
 than `##__private`. Instead let's use something like `x ##
 _MODULE_NAME_private_field` maybe?

 The `pvt` version is fine with me.

 If this is going to be a shared macro, lib/cc seems like a decent place
 for it, but I'm not sure we want to use this same macro everywhere: I
 think we'd like to mangle member names differently depending on which
 module owns them.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29209#comment:14>
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