RFR: 8276615: Update CR number of some tests in ProblemList-zgc.txt

[Yasumasa Suenaga]

Following tests are referred to [JDK-8220624](https://bugs.openjdk.java.net/browse/JDK-8220624), however it has been closed due to all subtasks were resolved.

* resourcehogs/serviceability/sa/TestHeapDumpForLargeArray.java
* serviceability/sa/CDSJMapClstats.java
* serviceability/sa/ClhsdbJhisto.java

We will work these problems in [JDK-8276539](https://bugs.openjdk.java.net/browse/JDK-8276539), so we need to update CR number of them.

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Commit messages:
 - 8276615: Update CR number of some tests in ProblemList-zgc.txt

Changes: https://git.openjdk.java.net/jdk/pull/6244/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6244&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276615
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6244.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6244/head:pull/6244

PR: https://git.openjdk.java.net/jdk/pull/6244