[jdk11u-dev] RFR: 8267348: Rewrite gc/epsilon/TestClasses.java to use Metaspace with less classes

[Aleksey Shipilev]

Unclean backport, because the test is in old package (thus need to drop `gc.epsilon` package). Passes `gc/epsilon`.

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Commit messages:
 - 8267348: Rewrite gc/epsilon/TestClasses.java to use Metaspace with less classes

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/70/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=70&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267348
  Stats: 16 lines in 1 file changed: 12 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/70.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/70/head:pull/70

PR: https://git.openjdk.java.net/jdk11u-dev/pull/70