RFR: 8332125: [nmt] Totals in diff report should print out total malloc and mmap diffs [v3]

[Sonia Zaldana Calles]

> Hi all, 
> 
> This PR addresses [8332125](https://bugs.openjdk.org/browse/JDK-8332125) enabling printing total malloc and mmap diffs when printing an NMT diff report. 
> 
> Testing: 
> - [x] Added test case passes. 
> 
> Thanks, 
> Sonia

Sonia Zaldana Calles has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge master
 - Merge branch 'openjdk:master' into JDK-8332125
 - 8332125: [nmt] Totals in diff report should print out total malloc and mmap diffs

-------------

Changes: https://git.openjdk.org/jdk/pull/19373/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19373&range=02
  Stats: 135 lines in 2 files changed: 135 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19373.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19373/head:pull/19373

PR: https://git.openjdk.org/jdk/pull/19373