RFR: 8259845: Move placeholder implementation details to cpp file and add logging [v2]

[Coleen Phillimore]

On Sun, 24 Jan 2021 21:50:27 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Make 'log' inline.
>
> Looks good.
> 
> Thanks,
> David

Thanks David.

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PR: https://git.openjdk.java.net/jdk/pull/2204