Review request for JDK-8071991

[Attila Szegedi]

Please review JDK-8071991 at <http://cr.openjdk.java.net/~attila/8071991/webrev.00> for <https://bugs.openjdk.java.net/browse/JDK-8071991>

Unfortunately, backporting JDK-8067139 bit-by-bit managed to introduce a compile error as 8u-dev Nashorn diverges from 9 Nashorn in Parser.java. I failed to notice and fix that in time, so I expect 8u-dev build now breaks. Fixing post haste. I will suggest we backport the parser changes too so this can't cause issues in the future.

Thanks and apologies,
  Attila.