RFR: JDK-8293003: Review running time of Warn5 regression test

Thu Sep 1 21:52:57 UTC 2022

Refactoring of the Warn5 regression test to reduce its running time by more than 50%.

Included a small refactoring in Warn4 to use text blocks too.

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Commit messages:
 - JDK-8293003: Review running time of Warn5 regression test

Changes: https://git.openjdk.org/jdk/pull/10130/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10130&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293003
  Stats: 28 lines in 2 files changed: 9 ins; 1 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/10130.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10130/head:pull/10130

PR: https://git.openjdk.org/jdk/pull/10130