RFR: 8315362: NMT: summary diff reports threads count incorrectly [v8]

[Evgeny Ignatenko]

> 8315362: NMT: summary diff reports threads count incorrectly

Evgeny Ignatenko has updated the pull request incrementally with one additional commit since the last revision:

  Review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15490/files
  - new: https://git.openjdk.org/jdk/pull/15490/files/9aed8dfd..973d6684

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15490&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15490&range=06-07

  Stats: 15 lines in 2 files changed: 7 ins; 8 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15490.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15490/head:pull/15490

PR: https://git.openjdk.org/jdk/pull/15490