RFR: 8263002: Remove CDS MiscCode region [v3]

[Yi Yang]

On Wed, 10 Mar 2021 06:07:04 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> wow.  Looks good to me.
>
> Thanks @coleenp and @dholmes-ora for the review!

Hi @iklam, sorry to bother you, I found there are some comments that still refer to [lingering mc regions](https://github.com/openjdk/jdk/compare/master...kelthuzadx:residual_mc_region).

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PR: https://git.openjdk.java.net/jdk/pull/2861