_prepare_dnu_arguments needs to be unroll safe

- otherwise, it is going to be excluded from traces

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added DoesNotUnderstandTest to test runner

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Updated core-lib

Adds a few reflective benchmarks

Signed-off-by: Stefan Marr <git@stefan-marr.de>