RFR: 8310143: RandomCommandsTest fails due to unexpected VM exit code after JDK-8282797 [v2]

[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

Tobias Hartmann has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Set isValid properly and inside of the loop
 - Merge branch 'JDK-8310143' of https://github.com/TobiHartmann/jdk into JDK-8310143
 - 8310143: RandomCommandsTest fails due to unexpected VM exit code after JDK-8282797

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14514/files
  - new: https://git.openjdk.org/jdk/pull/14514/files/61f44405..689bf927

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14514&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14514&range=00-01

  Stats: 4331 lines in 207 files changed: 3184 ins; 303 del; 844 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