8159220: Preserve position info in module import and export entriesReviewed-by: sundar, lagergren
8158250: nashorn ant javadoc targets are brokenReviewed-by: hannesw, mhaupt
8134503: support ES6 parsing in NashornReviewed-by: jlaskey, sundar, mhauptContributed-by: andreas.woess@oracle.com