RFR: 8310618: Test serviceability/sa/ClhsdbDumpclass.java fails after 8242152: 'StackMapTable:' missing from stdout/stderr

[Daohan Qu]

This patch should fix [JDK-8310618](https://bugs.openjdk.org/browse/JDK-8310618). It attempts to correct my errors in fixing [JDK-8242152](https://bugs.openjdk.org/browse/JDK-8242152).

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Commit messages:
 - Let javap print additional info for checking

Changes: https://git.openjdk.org/jdk/pull/14612/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14612&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310618
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14612.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14612/head:pull/14612

PR: https://git.openjdk.org/jdk/pull/14612