RFR: JDK-8164124 - [BACKOUT] G1 does not implement millis_since_last_gc which is needed by RMI GC

[Jesper Wilhelmsson]

Hi,

JDK-8071770 caused some problems and we have decided to back it out to get a 
clean snapshot for PIT.

The backout will be pushed to jdk9/dev together with the jdk9/hs snapshot and 
brought back into jdk9/hs later.

Bug: https://bugs.openjdk.java.net/browse/JDK-8164124
Webrev: http://cr.openjdk.java.net/~jwilhelm/8164124/webrev.00/

Thanks,
/Jesper