allow to switch to a pure Perl 6 slang, not just NQP
allow to switch to a pure Perl 6 slang, not just NQP

We are now very careful when calling into the foreign statementlist,
and also when we get the match and the made result back, we turn this
into a NQP-level match. This means that language switching is slightly
more expensive then before, but the other approach would make grammars
in general slower.

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