RFR: 8359110: Log accumulated GC and process CPU time upon VM exit [v17]

[Jonas Norlinder]

> Add support to log CPU cost for GC during VM exit with `-Xlog:gc+cpu`.
> 
> 
> [2,430s][info][gc,cpu] GC CPU usage: 22,87% (Process: 26,8926s GC: 6,1491s)

Jonas Norlinder has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 27 commits:

 - Move call to print_tracing_info
 - Merge branch 'master' into gc_cpu_time
 - Remove static and move string_dedup_cpu_time into elapsed_gc_cpu_time
 - Fixes after @albertnetymk review
 - Change output per discussion
 - Make stop protected, remove integer divison, remove unused method
 - Update closure name
 - vtime -> cpu_time and _vm_vtime -> _vmthread_cpu_time
 - Fixes after review from @stefank
 - Merge branch 'master' of github.com:JonasNorlinder/openjdk_jdk into gc_cpu_time
 - ... and 17 more: https://git.openjdk.org/jdk/compare/c75df634...f9c3aa64

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Changes: https://git.openjdk.org/jdk/pull/25779/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25779&range=16
  Stats: 258 lines in 16 files changed: 244 ins; 9 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/25779.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25779/head:pull/25779

PR: https://git.openjdk.org/jdk/pull/25779