[jdk11u-dev] RFR: 8299520: TestPrintXML.java output error messages in case compare fails

[Matthias Baesken]

8299520: TestPrintXML.java output error messages in case compare fails

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Commit messages:
 - Backport ea25a561c57cba63c5581aefa21f92ffd7386244

Changes: https://git.openjdk.org/jdk11u-dev/pull/1770/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1770&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299520
  Stats: 12 lines in 1 file changed: 11 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1770.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1770/head:pull/1770

PR: https://git.openjdk.org/jdk11u-dev/pull/1770