RFR: JDK-8254189: Improve comments for StackOverFlow and fix in_xxx() functions [v2]

[Thomas Stuefe]

On Tue, 27 Oct 2020 08:04:41 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Feedback David
>
> Marked as reviewed by dholmes (Reviewer).

Ping... May I have a second review please? Its quite trivial.
Patch was tested in our internal systems and no problems surfaced.

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PR: https://git.openjdk.java.net/jdk/pull/795