[jdk18] RFR: 8279695: [TESTBUG] modify compiler/loopopts/TestSkeletonPredicateNegation.java to run on C1 also

[Fairoz Matte]

8279695: [TESTBUG] modify compiler/loopopts/TestSkeletonPredicateNegation.java to run on C1 also

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Commit messages:
 - 8279695: [TESTBUG] modify compiler/loopopts/TestSkeletonPredicateNegation.java to run on C1 also

Changes: https://git.openjdk.java.net/jdk18/pull/92/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18&pr=92&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279695
  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk18/pull/92.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18 pull/92/head:pull/92

PR: https://git.openjdk.java.net/jdk18/pull/92