[8u-dev] Request for Approval: 8135000: Number.prototype.toFixed returns wrong string for 0.5 and -0.5

[Hannes Wallnoefer]

Please approve backport of 8135000 to 8u-dev.

Bug: https://bugs.openjdk.java.net/browse/JDK-8135000
Webrev: http://cr.openjdk.java.net/~hannesw/8135000/webrev/
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-September/005187.html

Changes apply cleanly to jdk8u-dev after path reshuffling.

Thanks,
Hannes