RFR: 8368793: java/lang/StringBuilder/RacingSBThreads.java timed out in Xcomp subtest

[Roger Riggs]

To avoid timeout in -Xcomp run of RacingSBThreads test raise the timeout to 240 on -Xcomp run.

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Commit messages:
 - 8368793: java/lang/StringBuilder/RacingSBThreads.java timed out in Xcomp subtest

Changes: https://git.openjdk.org/jdk/pull/27531/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27531&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368793
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27531.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27531/head:pull/27531

PR: https://git.openjdk.org/jdk/pull/27531