[jdk25u-dev] RFR: 8357380: java/lang/StringBuilder/RacingSBThreads.java times out with C1

[Goetz Lindenmaier]

Fix the test, needs to go to 21, too.

-------------

Commit messages:
 - Backport 30d20036987c9d68eb76b1e0401821386a76bb07

Changes: https://git.openjdk.org/jdk25u-dev/pull/124/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=124&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357380
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/124.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/124/head:pull/124

PR: https://git.openjdk.org/jdk25u-dev/pull/124