RFR: 8301737: java/rmi/server/UnicastRemoteObject/serialFilter/FilterUROTest.java fail with -Xcomp

[SUN Guoyun]

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

This PR fix the issue, Please help review it.

Thanks.

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Commit messages:
 - 8301737: java/rmi/server/UnicastRemoteObject/serialFilter/FilterUROTest.java fail with -Xcomp

Changes: https://git.openjdk.org/jdk/pull/12399/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12399&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301737
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12399.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12399/head:pull/12399

PR: https://git.openjdk.org/jdk/pull/12399