[jdk17u-dev] RFR: 8280391: NMT: Correct NMT tag on CollectedHeap

[Aleksey Shipilev]

Clean backport to improve NMT reporting.

Additional testing:
 - [x] Linux x86_64 fastdebug `tier1` -- some unrelated failures

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Commit messages:
 - Backport 44db4794d29c6e0755a6dc0ea1346f48f918155b

Changes: https://git.openjdk.org/jdk17u-dev/pull/883/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=883&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8280391
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/883.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/883/head:pull/883

PR: https://git.openjdk.org/jdk17u-dev/pull/883