RFR: 8315717: ProblemList serviceability/sa/TestHeapDumpForInvokeDynamic.java with ZGC

[Daniel D. Daugherty]

A trivial fix to ProblemList serviceability/sa/TestHeapDumpForInvokeDynamic.java with ZGC.

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Commit messages:
 - 8315717: ProblemList serviceability/sa/TestHeapDumpForInvokeDynamic.java with ZGC

Changes: https://git.openjdk.org/jdk/pull/15570/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15570&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315717
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15570.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15570/head:pull/15570

PR: https://git.openjdk.org/jdk/pull/15570