RFR: 8343953: Test jdk/jfr/threading/TestDeepVirtualStackTrace.java fails with Parallel/Serial GC

[Leonid Mesnik]

Test fails because it doesn't always trigger jdk.ObjectAllocationOutsideTLAB event.

Test tries to trigger jdk.ObjectAllocationOutsideTLAB by allocating 
new Object[10_000_000];
array.

However, the TLAB is not limited for Parallel/Serial/Z GCs. So VM might just increase TLAB and allocate the array in new TLAB. The fix limit young generation size to ensure that TLAB of expected size can't be created and
 jdk.ObjectAllocationOutsideTLAB  event is always generated.
Verified by running 100 times with Parallel/Serial/ZGC on different platforms.

Using  jdk.ObjectAllocationOutsideTLAB is not  the signifcant for the test. The better fix would be trigger some other event with 100% guarantee assuming that this event is not triggered outside of virtual thread. But not sure I which event is the good candidate.

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Commit messages:
 - Test jdk/jfr/threading/TestDeepVirtualStackTrace.java fails with Parallel/Serial GC

Changes: https://git.openjdk.org/jdk/pull/22052/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22052&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343953
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/22052.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22052/head:pull/22052

PR: https://git.openjdk.org/jdk/pull/22052