RFR: 8318622: ProblemList gc/cslocker/TestCSLocker.java on linux-x64 in Xcomp mode

[Daniel D. Daugherty]

A trivial fix to ProblemList gc/cslocker/TestCSLocker.java on linux-x64 in Xcomp mode.

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Commit messages:
 - 8318622: ProblemList gc/cslocker/TestCSLocker.java on linux-x64 in Xcomp mode

Changes: https://git.openjdk.org/jdk/pull/16296/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16296&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318622
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16296.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16296/head:pull/16296

PR: https://git.openjdk.org/jdk/pull/16296