RFR: 8332122: [nmt] Totals for malloc should show total peak

[Sonia Zaldana Calles]

Hi all, 

This PR addresses [8332122](https://bugs.openjdk.org/browse/JDK-8332122). 

With this patch, we enable printing global malloc peaks in NMT when printing summary information. 

Testing: 
- [x] Added test case passes. 

Thanks, 
Sonia

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Commit messages:
 - 8332122: [nmt] Totals for malloc should show total peak

Changes: https://git.openjdk.org/jdk/pull/19333/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19333&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332122
  Stats: 109 lines in 3 files changed: 107 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/19333.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19333/head:pull/19333

PR: https://git.openjdk.org/jdk/pull/19333