RFR: 8339220: [s390x] TestIfMinMax.java failure

[Amit Kumar]

This test enables Conditional moves for long operands for s390x. Which fixes the test-case.

Ran tier1 and not saw any regression.

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Commit messages:
 - enable conditional moves

Changes: https://git.openjdk.org/jdk/pull/21198/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21198&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339220
  Stats: 21 lines in 3 files changed: 13 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/21198.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21198/head:pull/21198

PR: https://git.openjdk.org/jdk/pull/21198