RFR: 8315795: runtime/Safepoint/TestAbortVMOnSafepointTimeout.java fails after JDK-8305507

[Patricio Chilano Mateo]

Please review this small fix to test TestAbortVMOnSafepointTimeout.java. With the current value of AbortVMOnSafepointTimeoutDelay we get cases where the spawned child VM exits with a safepoint timeout but without the main thread being able to print the PRE_STALL_TEXT text. I added a more detailed analysis in the bug comments.
To fix it I increased the value of AbortVMOnSafepointTimeoutDelay to be about twice as much as the longest time it could take to print the PRE_STALL_TEXT based on the measurements I have done in the failing Windows machines.
Without the fix I can reproduce the issue in about 10% of the runs running tier1_runtime. With the fix I run ~400 runs of tier1_runtime without failures.

Thanks,
Patricio

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Commit messages:
 - v1

Changes: https://git.openjdk.org/jdk/pull/15622/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15622&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315795
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15622.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15622/head:pull/15622

PR: https://git.openjdk.org/jdk/pull/15622