RFR: 8278282: G1: Log basic statistics of evacuation failure

[lihuaming (A)]

Hi,

Can I have another reviewer for this pr? https://github.com/openjdk/jdk/pull/6860
(I have to send out this RFR manually, because my updates of this pr on github seem not trigger any email notification in hotspot-gc-dev at all.)

Thanks
-Hamlin