RFR: 8262060: compiler/whitebox/BlockingCompilation.java timed out

[Evgeny Nikitin]

Please review this small fix for a test.

Test fails sometimes when run with UsageTracker enabled. For some reason, a loading of ThreadLocalRandom can happen during the test run, and this invalidates Random.nextInt method (because it's not the only implementation now).

Fixed by pre-loading ThreadLocalRandom. Tested by multiple runs with UsageTracker enabled - approx. 1 out of 20-30 test runs fails without the fix and no failures spotted with the fix.

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Commit messages:
 - 8262060: compiler/whitebox/BlockingCompilation.java timed out

Changes: https://git.openjdk.java.net/jdk/pull/3224/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3224&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262060
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3224.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3224/head:pull/3224

PR: https://git.openjdk.java.net/jdk/pull/3224