RFR: 8340389: vmTestbase/gc/gctests/PhantomReference/phantom001/TestDescription.java Test exit code: 97 with -Xcomp UseAVX=3

[Thomas Schatzl]

Hi all,

  please review this fix to the phantom001 test to do much less garbage collections that inhibit passing the test.

Testing: gha, running the test with and without the change for 500 times with the problematic options - fails 379 times without the change, passes all runs with the change.

Thanks,
   Thomas

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Commit messages:
 - 8340389

Changes: https://git.openjdk.org/jdk/pull/21538/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21538&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340389
  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21538.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21538/head:pull/21538

PR: https://git.openjdk.org/jdk/pull/21538