RFR: 8351656: Problemlist gc/TestAllocHumongousFragment#generational

[Aleksey Shipilev]

Causes noise in GHA testing, so we need to problemlist it. 

Additional testing:
 - [x] Checked the test is skipped locally

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jdk/pull/23982/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23982&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351656
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23982.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23982/head:pull/23982

PR: https://git.openjdk.org/jdk/pull/23982