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handle_wrap: expose {un}refed check to JS

Rodrigo Muino Tomonari requested to merge github/fork/Fishrock123/handle-unrefed into master

Pull Request check-list

  • Does make -j8 test (UNIX) or vcbuild test nosign (Windows) pass with this change (including linting)?
  • Is the commit message formatted according to CONTRIBUTING.md?

Affected core subsystem(s)

handle_wrap

Description of change

Give tools a consistent way to check if a handle is unrefed that works for all of our APIs that expose handles. E.g. would be very helpful to see which handles are umrefed in @AndreasMadsen's https://github.com/AndreasMadsen/dprof

(Some APIs, like timers, do not normally expose handles and are not addressed at that level here)

Refs: https://github.com/nodejs/node/pull/5828 Refs: https://github.com/nodejs/node/pull/5827

R= @trevnorris cc @thlorenz

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