RFR: 8367318: Test vmTestbase/nsk/jdi/MethodEntryRequest/addClassFilter_rt/filter_rt001/TestDescription.java timed out after passing [v2]

[Chris Plummer]

> Fixed an issue with a race with two events coming in close to the same time, the first of which does not suspend any debuggee threads. More details in the first comment.
> 
> Tested by running all vmTestbase/nsk/jdi tests 25x times on all platforms both with and w/o virtual threads. Also ran all tier5 svc tests.

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

  remove unneeded synchronized

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27370/files
  - new: https://git.openjdk.org/jdk/pull/27370/files/6eac67ab..1849f079

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27370&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27370&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/27370.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27370/head:pull/27370

PR: https://git.openjdk.org/jdk/pull/27370