RFR: 8309346: Extend hs_err logging for all VM operations deriving from VM_GC_Operation [v2]

[Daohan Qu]

> This patch implements `cause()` for `VM_GC_Operation` and its derived classes. It follows [JDK-8309210](https://bugs.openjdk.org/browse/JDK-8309210) to provide more detailed info for `VM_GC_Operation`s in hs_err log file.

Daohan Qu has updated the pull request incrementally with one additional commit since the last revision:

  Use override instead of virtual

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14287/files
  - new: https://git.openjdk.org/jdk/pull/14287/files/6424880e..63d5edf4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14287&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14287&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14287.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14287/head:pull/14287

PR: https://git.openjdk.org/jdk/pull/14287