RFR: 8303523: Cleanup problem listing of nsk/jvmti/AttachOnDemand/attach002a/TestDescription.java

[Chris Plummer]

attach002a is problem listed under [JDK-8277812](https://bugs.openjdk.org/browse/JDK-8277812), which has been closed as a dup of [JDK-8277573](https://bugs.openjdk.org/browse/JDK-8277573), so its problem list entry should be updated to reflect this. The other issue is that it is currently in the general problem list, but only occurs with -Xcomp, so it needs to be moved to ProblemList-Xcomp.txt.

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Commit messages:
 - Fix problem list entry for attach002a

Changes: https://git.openjdk.org/jdk/pull/12836/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12836&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303523
  Stats: 2 lines in 2 files changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/12836.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12836/head:pull/12836

PR: https://git.openjdk.org/jdk/pull/12836