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

[Albert Mingkun Yang]

On Mon, 24 Oct 2022 14:28:24 GMT, Thomas Schatzl <tschatzl 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).

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