Allow nqp::handle(...) use in Perl 6 code.
Merge branch 'nom' of github.com:rakudo/rakudo into nom
Redo MapIter with nqp ops; handle next/last/redo.

This tosses the JVM specific version with something generic, which
means it can be re-used for MoarVM later on too. pmichaud++ for the
suggestion to do it this way.