[jdk17u-dev] RFR: 8303822: gtestMain should give more helpful output

[Matthias Baesken]

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Commit messages:
 - Backport 0f26d09da881b1dfedfc0dcaff46fc169fa1f020

Changes: https://git.openjdk.org/jdk17u-dev/pull/1209/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1209&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303822
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1209.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1209/head:pull/1209

PR: https://git.openjdk.org/jdk17u-dev/pull/1209