RFR: 8274114: ProblemList serviceability/sa/TestJhsdbJstackMixed.java on linux-aarch64 in -Xcomp mode

[Daniel D.Daugherty]

A trivial fix to ProblemList serviceability/sa/TestJhsdbJstackMixed.java on linux-aarch64 in -Xcomp mode.

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Commit messages:
 - 8274114: ProblemList serviceability/sa/TestJhsdbJstackMixed.java on linux-aarch64 in -Xcomp mode

Changes: https://git.openjdk.java.net/jdk/pull/5624/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5624&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274114
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5624.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5624/head:pull/5624

PR: https://git.openjdk.java.net/jdk/pull/5624