RFR: 8311179: Generational ZGC: gc/z/TestSmallHeap.java failed with OutOfMemoryError

[Stefan Karlsson]

I propose that we remove the 8M config to get rid of some OOME failures under certain conditions.

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Commit messages:
 -  8311179: Generational ZGC: gc/z/TestSmallHeap.java failed with OutOfMemoryError

Changes: https://git.openjdk.org/jdk/pull/15184/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15184&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311179
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15184.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15184/head:pull/15184

PR: https://git.openjdk.org/jdk/pull/15184