RFR: 8314840: 3 gc/epsilon tests ignore external vm options

[Ramkumar Sunderbabu]

These tests do not pass Java/JVM test command line options (flags) to the child process. More details in JBS.
Tiers 1 to 3 tested. Along with various flag combinations.

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Commit messages:
 - prepend test java opts

Changes: https://git.openjdk.org/jdk/pull/23751/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23751&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314840
  Stats: 9 lines in 3 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/23751.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23751/head:pull/23751

PR: https://git.openjdk.org/jdk/pull/23751