[jdk25u-dev] RFR: 8372860: TestCodeCacheUnloadDuringConcCycle fails on ARM32

[Roman Marchenko]

Clean backport. 
Test changes only. No risk.

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Commit messages:
 - Backport 6a6ff876c515eba6cc89320e02dc5739d4540316

Changes: https://git.openjdk.org/jdk25u-dev/pull/152/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=152&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372860
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/152.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/152/head:pull/152

PR: https://git.openjdk.org/jdk25u-dev/pull/152