RFR: 8141280: Implementation of survivor_is_full() and old_is_full() should be in G1DefaultAllocator

[Stefan Johansson]

Hi,

Please review this small change to move the implementation of 
survivor_is_full() and old_is_full() from G1Allocator to 
G1DefaultAllocator. The declaration is left in G1Allocator and made pure 
virtual.

Webrev:
http://cr.openjdk.java.net/~sjohanss/8141280/hotspot.00/

Testing:
JPRT

Thanks,
Stefan