[jdk17u-dev] RFR: 8316451: 6 java/lang/instrument/PremainClass tests ignore VM flags

[Goetz Lindenmaier]

I backport this to keep the tests up-to-date. Many similar changes have been backported. Let's do this, too, to complete the job. This will simplify later backports.

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

Commit messages:
 - Backport 9029bf644e238a504e1f114a73edf5760d19980b

Changes: https://git.openjdk.org/jdk17u-dev/pull/3465/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3465&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316451
  Stats: 10 lines in 2 files changed: 0 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3465.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3465/head:pull/3465

PR: https://git.openjdk.org/jdk17u-dev/pull/3465