RFR: 8263464: NMT: assert in gtest os.release_multi_mappings_vm

[Gerard Ziemski]

On Thu, 4 May 2023 18:57:18 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

> This fix allows NMT to account for released memory that was allocated in chunks, as long as the final pointer and size refer to total contiguous regions of the requested size.
> 
> Tested via `Mach5 tier1,tier2,tier3` and locally via `gtest:NMT*:os*`

@tstuefe You might be interested in reviewing this one.

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PR Comment: https://git.openjdk.org/jdk/pull/13813#issuecomment-1535314390