Code Review Request: 6819085 G1: use larger and/or user settable region size

[Tony Printezis]

http://cr.openjdk.java.net/~tonyp/6819085/webrev.0/

The idea is to allow the user to set the region size with a parameter 
(-XX:G1HeapRegionSize=N).

Tony

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| Tony Printezis, Staff Engineer    | Sun Microsystems Inc.          |
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