RFR: 8357184: Test vmTestbase/nsk/jdi/ExceptionEvent/_itself_/exevent008/TestDescription.java fails with unreported exception [v2]

[Chris Plummer]

> Based on the log output, the test failure seems to be the result of two threads trying to set and access variables that are not volatile, so I've made them volatile. Since I can't reproduce the failure, I can't confirm that it is now fixed, but the lack of volatile is clearly a bug so should be done anyway. Tested by running the test locally to make sure nothing breaks.

Chris Plummer has updated the pull request incrementally with one additional commit since the last revision:

  cleaned up event counters

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25236/files
  - new: https://git.openjdk.org/jdk/pull/25236/files/ef35ffa9..1304cd72

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25236&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25236&range=00-01

  Stats: 9 lines in 1 file changed: 0 ins; 2 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/25236.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25236/head:pull/25236

PR: https://git.openjdk.org/jdk/pull/25236