RFR: Backport of: JDK-8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps

[Bengt Rutisson]

Hi all,

Can I have a couple of reviews for this backport?

The fix for JDK-8043607 applied cleanly to the 8 update repository, but 
as I mentioned in the original review I would like to change the default 
value for the logging flag when I backport this.

Here's the webrev for the backport to 8u:

http://cr.openjdk.java.net/~brutisso/8043607/webrev.8u.00/

The only change compared to what was pushed to JDK 9 is that in 
globals.hpp the default value for PrintGCID is different.

JDK8:
http://cr.openjdk.java.net/~brutisso/8043607/webrev.8u.00/src/share/vm/runtime/globals.hpp.udiff.html

JDK9:
http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/dabee7bb3a8f#l29.7


Thanks,
Bengt