RFR: 8310143: RandomCommandsTest fails due to unexpected VM exit code after JDK-8282797

[Tobias Hartmann]

The fix for [JDK-8282797](https://bugs.openjdk.org/browse/JDK-8282797) missed that randomly generated Compile Commands can be invalid. I verified with the corresponding seeds that all occurrences of this intermittent failure are now fixed.

Thanks,
Tobias

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Commit messages:
 - 8310143: RandomCommandsTest fails due to unexpected VM exit code after JDK-8282797

Changes: https://git.openjdk.org/jdk/pull/14514/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14514&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310143
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14514.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14514/head:pull/14514

PR: https://git.openjdk.org/jdk/pull/14514