RFR: 8293514: ProblemList gc/metaspace/TestMetaspacePerfCounters.java#Epsilon-64 on all platforms

[Daniel D. Daugherty]

A trivial fix to ProblemList gc/metaspace/TestMetaspacePerfCounters.java#Epsilon-64 on all platforms.

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Commit messages:
 - 8293514: ProblemList gc/metaspace/TestMetaspacePerfCounters.java#Epsilon-64 on all platforms

Changes: https://git.openjdk.org/jdk/pull/10208/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10208&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293514
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10208.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10208/head:pull/10208

PR: https://git.openjdk.org/jdk/pull/10208