Review request for JDK-8144131: ArrayData.getInt implementations do not convert to int32

[Hannes Wallnoefer]

Please review JDK-8144131: ArrayData.getInt implementations do not 
convert to int32:

http://cr.openjdk.java.net/~hannesw/8144131/webrev/
for https://bugs.openjdk.java.net/browse/JDK-8144131

I piggybacked a small fix to keep unary plus/minus from changing the 
type of long literals to doubles. I'm not sure if that is serious enough 
that it should get its own bug, let me know if you think so.

Hannes