RFR: 8234440: ZGC: Print relocation information on info level

[Per Liden]

I got some off-line comments from Stefan, updated webrev:

Diff: http://cr.openjdk.java.net/~pliden/8234440/webrev.1-diff
Full: http://cr.openjdk.java.net/~pliden/8234440/webrev.1

/Per

On 1/21/20 11:18 AM, Per Liden wrote:
> When using -Xlog:gc*, I now and then find that I miss basic relocation 
> information, since it's currently printed at the debug level on the 
> relocation set selector. I think we should leave the current logging as 
> is, since that's still useful when debugging the relocation set selector 
> itself. However, I think we should propagate some of the high level 
> information and print it on the info level.
> 
> Here's an example of what the output looks like with this patch:
> 
> [...]
> [68.926s][info][gc,reloc    ] GC(6) Small Pages: 529 / 1058M(93%), 
> Empty: 350M(31%), Compacting: 450M(40%)->20M(2%)
> [68.926s][info][gc,reloc    ] GC(6) Medium Pages: 2 / 64M(6%), Empty: 
> 0M(0%), Compacting: 64M(6%)->32M(3%)
> [68.926s][info][gc,reloc    ] GC(6) Large Pages: 2 / 12M(1%), Empty: 
> 6M(1%), Compacting: 0M(0%)->0M(0%)
> [68.926s][info][gc,reloc    ] GC(6) Relocation: Successful
> [...]
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8234440
> Webrev: http://cr.openjdk.java.net/~pliden/8234440/webrev.0
> 
> /Per