RFR: JDK-8256864: [windows] Improve tracing for mapping errors [v5]

[Thomas Stuefe]

On Tue, 1 Dec 2020 20:37:18 GMT, Ioi Lam <iklam at openjdk.org> wrote:

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

Thanks @iklam and @reinrich . All tests went through sucessfully tonight.

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PR: https://git.openjdk.java.net/jdk/pull/1390