[Gc] move_disappearing_link to release?

[Andy Wingo]

Hi,

GC_move_disappearing_link is performance boost to some applications that
I work on.  It's a fairly simple extension to the existing disappearing
link facility.  Any chance of it appearing in the next release?

FWIW, I tried the following on the release branch:

  git cherry-pick c3cc33f676502406416cb3caac13fab3a8fbc49b..5c53923e5f8d63b789bf0ecaad0776fe1abbdf12

And that landed all of the disappearing links patches, with no
conflicts.

Regards,

Andy
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