[jdk17u-dev] RFR: 8278146: G1: Rework VM_G1Concurrent VMOp to clearly identify it as pause [v2]

[Aleksey Shipilev]

> Clean backport to improve detailed VM diagnostics.
> 
> @tschatzl, are you good with this in 17u?
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `tier1`

Aleksey Shipilev 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 one additional commit since the last revision:

  Backport 3a1fca3adf3111a966cb62d926b95acc89b7fe97

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/910/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/910/files/5ea52d32..3c20e4b8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=910&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=910&range=00-01

  Stats: 51475 lines in 952 files changed: 40079 ins; 4771 del; 6625 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/910.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/910/head:pull/910

PR: https://git.openjdk.org/jdk17u-dev/pull/910