RFR: 8356847: Problem list two test cases for JDK-8284234

[Leo Korinth]

These tests fails intermittently. Problem list until JDK-8284234 is solved.

I have verified (rebased on https://bugs.openjdk.org/browse/JDK-8356866) with:

test=vmTestbase/gc/gctests/FinalizeTest04/FinalizeTest04.java
make run-test TEST="${test}" JTREG="RETAIN=all;VERBOSE=all;OPTIONS=--verify-exclude"
test=vmTestbase/gc/gctests/PhantomReference/phantom001/phantom001.java
make run-test TEST="${test}" JTREG="RETAIN=all;VERBOSE=all;OPTIONS=--verify-exclude"

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Commit messages:
 - 8356847: Problem list two test cases for JDK-8284234

Changes: https://git.openjdk.org/jdk/pull/25209/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25209&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356847
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25209.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25209/head:pull/25209

PR: https://git.openjdk.org/jdk/pull/25209