RFR: 8301736: jdk/incubator/concurrent/StructuredTaskScope/StructuredTaskScopeTest.java fail with -Xcomp

[SUN Guoyun]

Hi all,
When `-Xcomp` be used, java thread to block for longer, then causing StructuredTaskScopeTest.java failed frequently on the AArch64 and LoongArch64 architecture.

This PR fix the issue, Please help review it.

Thanks.

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Commit messages:
 - 8301736: jdk/incubator/concurrent/StructuredTaskScope/StructuredTaskScopeTest.java fail with -Xcomp

Changes: https://git.openjdk.org/jdk/pull/12398/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12398&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301736
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12398.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12398/head:pull/12398

PR: https://git.openjdk.org/jdk/pull/12398