RFR: 8242078: G1: Improve concurrent refinement analytics and logging

[Stefan Johansson]

On 2020-04-14 14:59, Kim Barrett wrote:
> 
> The LogTarget was to only say the logging selection once, but admittedly that’s not
> common practice and it probably reads better being explicit, so done.
> 
> New webrevs:
> full: https://cr.openjdk.java.net/~kbarrett/8242078/open.02/
Looks good,
Stefan

> incr: https://cr.openjdk.java.net/~kbarrett/8242078/open.02.inc/
> 
> Testing: local (linux-x64) hs-tier1, which includes TestGCLogMessages.
> 
> 
>