RFR: 8339419: [s390x] Problemlist compiler/c2/irTests/TestIfMinMax.java

[Amit Kumar]

TestIfMinMax.java is failing on s390x, for now I want to disable this test for s390x-platform. In future whenever the failure will be fixed with [JDK-8339220](https://bugs.openjdk.org/browse/JDK-8339220), changes done by this PR will be reverted.

I guess this is trivial patch and one review will be required.

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Commit messages:
 - problemlist

Changes: https://git.openjdk.org/jdk/pull/20827/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20827&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339419
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20827.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20827/head:pull/20827

PR: https://git.openjdk.org/jdk/pull/20827