RFR: 8332125: [nmt] Totals in diff report should print out total malloc and mmap diffs [v4]

[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 incrementally with one additional commit since the last revision:

  Changes based on feedback - improving test and replacing newline characters

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19373/files
  - new: https://git.openjdk.org/jdk/pull/19373/files/40164e4f..2a9aa4c5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19373&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19373&range=02-03

  Stats: 11 lines in 2 files changed: 2 ins; 2 del; 7 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