RFR: 8284027: vmTestbase/nsk/jvmti/GetAllThreads/allthr001/ is failing [v2]

[Alex Menkov]

> The test counts all "system" threads before the execution and expects that this number remains the same during test execution.
> This makes the test fragile - JVM may start internal threads, some threads may end.
> 
> The fix updates the test:
> - the test checks only test threads, and verify that the live threads are reported by GetAllThreads and terminated threads are not reported;
> - dropped "system" thread counting stuff;
> - added proper deallocation of GetThreadInfo results.

Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:

  feedback

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8512/files
  - new: https://git.openjdk.java.net/jdk/pull/8512/files/a7ae12d8..1539460c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8512&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8512&range=00-01

  Stats: 7 lines in 1 file changed: 1 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8512.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8512/head:pull/8512

PR: https://git.openjdk.java.net/jdk/pull/8512