RFR: 8286442: ProblemList compiler/c2/irTests/TestSkeletonPredicates.java in -Xcomp mode

[Daniel D.Daugherty]

A trivial fix to ProblemList compiler/c2/irTests/TestSkeletonPredicates.java in -Xcomp mode.

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Commit messages:
 - 8286442: ProblemList compiler/c2/irTests/TestSkeletonPredicates.java in -Xcomp mode

Changes: https://git.openjdk.java.net/jdk/pull/8612/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8612&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286442
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8612.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8612/head:pull/8612

PR: https://git.openjdk.java.net/jdk/pull/8612