RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v31]

[Jonathan Joo]

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

Jonathan Joo has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 31 additional commits since the last revision:

 - Merge branch 'openjdk:master' into master
 - Add call to publish in parallel gc and update counter names
 - Add Copyright header to test and formatting changes
 - Fix test
 - add comment and change if defined to ifdef
 - Remove header and fix long to jlong
 - Update logic to use cmpxchg rather than add
 - Fix build issues
 - Fix logic for publishing total cpu time and convert atomic jlong to long
 - Fix more broken headers for sanity checks
 - ... and 21 more: https://git.openjdk.org/jdk/compare/a3b77dde...b57aa467

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15082/files
  - new: https://git.openjdk.org/jdk/pull/15082/files/19fe9b3a..b57aa467

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15082&range=30
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15082&range=29-30

  Stats: 128020 lines in 3548 files changed: 59061 ins; 26067 del; 42892 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