RFR: 8329839: Cleanup ZPhysicalMemoryBacking trace logging

[Axel Boldt-Christmas]

On Mon, 8 Apr 2024 09:12:33 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> On bsd the MB scaling is only performed on the length and not the base offset so the numbers printed are wrong.
> 
> On all other platforms the `zoffset` type is used incorrectly and should use `zoffset_end` when printing offsets that point to the end of a range.

Thanks for the reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/18671#issuecomment-2111651318