RFR: 8233214: Remove runtime code not needed with CMS removed [v2]

[Coleen Phillimore]

On Fri, 9 Oct 2020 13:07:35 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - fix comment
>>  - fix comment
>
> Good sans the "YC/CMS" comment

Thanks, I think this is trivial enough to integrate.

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PR: https://git.openjdk.java.net/jdk/pull/574