RFR: 8295838: Document why we do not print Code Cache Roots phase in G1 logging

[Thomas Schatzl]

On Mon, 24 Oct 2022 14:42:41 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I get reviews for this trivial addition of some comment why we do not measure the `Code Cache Roots` phase in G1 logging?
>> 
>> Testing: local compilation
>> 
>> Thanks,
>>   Thomas
>
> Marked as reviewed by ayang (Reviewer).

Thanks @albertnetymk @walulyai for your reviews

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PR: https://git.openjdk.org/jdk/pull/10835