[jdk17u-dev] RFR: 8269571: NMT should print total malloc bytes and invocation count

[Thomas Stuefe]

Hi all,

Backported as part of an ongoing effort to modernize jdk17 NMT.

This pull request contains a backport of commit [3ad20fcd](https://github.com/openjdk/jdk/commit/3ad20fcdfa35796c190ccbaf26872b0fe30d8c76) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Thomas Stuefe on 30 Jun 2021 and was reviewed by Zhengyu Gu and Xin Liu.

Thanks!

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

Commit messages:
 - Backport 3ad20fcdfa35796c190ccbaf26872b0fe30d8c76

Changes: https://git.openjdk.org/jdk17u-dev/pull/821/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=821&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8269571
  Stats: 25 lines in 3 files changed: 20 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/821.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/821/head:pull/821

PR: https://git.openjdk.org/jdk17u-dev/pull/821