Request for review (s) - 8031323: Optionally align objects copied to survivor spaces

[Jon Masamitsu]

8031323: Optionally align objects copied to survivor spaces

Add the option to specify an alignment for allocations into the
survivor spaces.  Survivor space allocations will overflow if the
survivor spaces have not been increased.   The expected use
is to align survivor space allocations to cache line sizes.

http://cr.openjdk.java.net/~jmasa/8031323/webrev.00/

Jon