RFR: 8263998: Remove mentions of mc region in comments

[Yumin Qi]

On Thu, 29 Apr 2021 17:27:08 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Hi, Please review the simple changes for removing the mc/MC mentioned in comments.  "mc" region was removed in fix of
>>  https://bugs.openjdk.java.net/browse/JDK-8263002
>> 
>> Tests: local build.
>> 
>> Thanks
>> Yumin
>
> Looks good and trivial.

@calvinccheung Thanks for quick review!

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PR: https://git.openjdk.java.net/jdk/pull/3799