RFR: 8315462: [REDO] runtime/NMT/SummarySanityCheck.java failed with "Total committed (MMMMMM) did not match the summarized committed (NNNNNN)" [v2]

[Afshin Zafari]

> When taking snapshot of malloc entries, other threads may update the items that already copied so change their corresponding sum/count. To make the sum/count values be consistent with whatever copied, they are calculated during copy and then set explicitly if any mismatch detected.
> The function body is also moved to cpp file.  
> 
> ### Tests
> mach5 tiers 1-5 all platforms.

Afshin Zafari has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge branch 'master' into _8315462
 - 8315462: [REDO] runtime/NMT/SummarySanityCheck.java failed with "Total committed (MMMMMM) did not match the summarized committed (NNNNNN)"

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Changes: https://git.openjdk.org/jdk/pull/16237/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16237&range=01
  Stats: 32 lines in 2 files changed: 22 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/16237.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16237/head:pull/16237

PR: https://git.openjdk.org/jdk/pull/16237