[jdk21u-dev] RFR: 8330621: Make 5 compiler tests use ProcessTools.executeProcess

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 5394f57f002c066021d811382a336253ae9f2014

Changes: https://git.openjdk.org/jdk21u-dev/pull/982/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=982&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330621
  Stats: 23 lines in 5 files changed: 5 ins; 4 del; 14 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/982.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/982/head:pull/982

PR: https://git.openjdk.org/jdk21u-dev/pull/982