RFR: 8273825: TestIRMatching.java fails after JDK-8266550

[Christian Hagedorn]

[JDK-8266550](https://bugs.openjdk.java.net/browse/JDK-8266550) changed the class hierarchy of types and thus had to adapt some default IR regexes. In this process, an additional "klass" + ";" was missed to remove in `CHECKCAST_ARRAY_OF` for the part matching platforms such as aarch64 or PPC.

Thanks,
Christian

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Commit messages:
 - 8273825: TestIRMatching.java fails after JDK-8266550 on aarch64

Changes: https://git.openjdk.java.net/jdk/pull/5555/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5555&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273825
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5555.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5555/head:pull/5555

PR: https://git.openjdk.java.net/jdk/pull/5555