[OpenJDK Rasterizer] Fix Overflow in Marlin ArrayCache

[Laurent Bourgès]

Hi Jim,

Here is a simple fix on potential overflow in ArrayCache.getNewLargeSize()
discussed during Marlin integration:
http://cr.openjdk.java.net/~lbourges/marlin/marlin-s6.0/

I added the ArrayCacheSizeTest class which now passes in jtreg.

Could you create a bug, I am not sure what I should fill in the form ?

Laurent
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