RFR: 8134504: Remove usage of EvacuationInfo from G1CollectorPolicy

[Erik Helin]

Hi all,

this tiny patch cleans up the relationship between the classes
EvacuationInfo and G1CollectorPolicy. There is no need for the
G1CollectorPolicy to take EvacuationInfo objects as arguments in two
methods just to fill in some data, it just complicates the signature of
those methods. With the patch the data is retrieved from the
G1CollectorPolicy using getters instead.

Webrev:
http://cr.openjdk.java.net/~ehelin/8134504/webrev.00/

Bug:
https://bugs.openjdk.java.net/browse/JDK-8134504

Testing:
JPRT

Thanks,
Erik