RFR: 8347434: Richer VM operations events logging [v2]

[Aleksey Shipilev]

> A simpler quality of diagnostics improvement. In hs_err, it is not abundantly clear if executed VM operations took safepoint or not, were nested or not. It would be good to print that out.

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 four additional commits since the last revision:

 - Simplify cause handling
 - A bit of white space
 - Merge branch 'master' into JDK-8347434-richer-vm-events
 - Fix

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23039/files
  - new: https://git.openjdk.org/jdk/pull/23039/files/c3b2f863..9b562f71

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23039&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23039&range=00-01

  Stats: 36441 lines in 1442 files changed: 12993 ins; 16262 del; 7186 mod
  Patch: https://git.openjdk.org/jdk/pull/23039.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23039/head:pull/23039

PR: https://git.openjdk.org/jdk/pull/23039