RFR: 8357511: [BACKOUT] 8357048: RunTest variables should always be assigned

[Mikael Vidstedt]

Backing out JDK-8357048 which broke testing.

Testing: tier5 (in progress)

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Commit messages:
 - 8357511: [BACKOUT] 8357048: RunTest variables should always be assigned

Changes: https://git.openjdk.org/jdk/pull/25374/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25374&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357511
  Stats: 6 lines in 1 file changed: 0 ins; 5 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25374.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25374/head:pull/25374

PR: https://git.openjdk.org/jdk/pull/25374