RFR: 8315149: Add hsperf counters for CPU time of JVM internal threads

[Jonathan Joo]

8315149: Add hsperf counters for CPU time of JVM internal threads

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Commit messages:
 - Add hsperf counters for CPU time of JVM internal threads

Changes: https://git.openjdk.org/jdk/pull/15082/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15082&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315149
  Stats: 170 lines in 17 files changed: 170 ins; 0 del; 0 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