Xloggc as manageable flag

[Jakub Kubrynski]

Hi,

currently we can turn on GC logging in runtime by using jinfo. It helps a
lot when we have to investigate gc related problems without restarting the
JVM. But currently we cannot set gc log filename in other way than
specifying -Xloggc. Maybe it'll be good idea to provide some modern
manageable flag like -XX:GCLogFileName?

-- 
Best regards,
Jakub Kubrynski
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