RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v42]

[Jonathan Joo]

> 8315149: Add hsperf counters for CPU time of internal GC threads

Jonathan Joo has updated the pull request incrementally with one additional commit since the last revision:

  Update parallel workers time after Remark

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15082/files
  - new: https://git.openjdk.org/jdk/pull/15082/files/533af850..189d1852

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15082&range=41
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15082&range=40-41

  Stats: 10 lines in 4 files changed: 5 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/15082.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15082/head:pull/15082

PR: https://git.openjdk.org/jdk/pull/15082