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lib,src: remove post-gc event infrastructure

Rodrigo Muino Tomonari requested to merge github/fork/bnoordhuis/remove-gc-event into v0.12

Remove the 'gc' event from the v8 module and remove the supporting infrastructure from src/. It gets the axe because:

  1. There are currently no users. It was originally conceived as an upstreamed subset of StrongLoop's strong-agent GC metrics, but the strong-agent code base has evolved considerably since that time and has no use anymore for what is in core.
  2. The implementation is not quite sound. It calls into JS land from inside the GC epilog and that is unsafe. We could fix that by delaying the callback until a safe time but because there are no users anyway, removing it is all around easier.

R=@trevnorris

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