[8u40] Request for approval: JDK-8062624: java.lang.String methods not available on concatenated strings

[Hannes Wallnoefer]

Please approve backport of JDK-8062624 to 8u40.

The patch applies cleanly to 8u40 after fixing path names.

Bug: https://bugs.openjdk.java.net/browse/JDK-8062624
Webrev: http://cr.openjdk.java.net/~hannesw/8062624/
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2014-November/003813.html
Changeset: http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/a22f9ba69baa

Thanks,
Hannes