Review request for JDK-8015350: Array.prototype.reduceRight issue with large length and index

[Hannes Wallnoefer]

Please review JDK-8015350: Array.prototype.reduceRight issue with large 
length and index:

http://cr.openjdk.java.net/~hannesw/8015350/

We have to use long indices (and uint32 instead of int32) for array 
iterators even if reduceRight is probably the only array method that 
allows to test this without running for hours.

Hannes