RFR: 8342074: Fix runtime/Thread/TestAlwaysPreTouchStacks.java to be flagless or accept VM flags [v2]

[Afshin Zafari]

> `createTestJavaProcessBuilder` is used for creating and running a new Java process that accepts flags.

Afshin Zafari 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:

 - Merge remote-tracking branch 'origin/master' into _8342074_process_accepts_vm_flags
 - Merge remote-tracking branch 'origin/master' into _8342074_process_accepts_vm_flags
 - 8342074: Fix runtime/Thread/TestAlwaysPreTouchStacks.java to be flagless or accept VM flags

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21945/files
  - new: https://git.openjdk.org/jdk/pull/21945/files/f7374cf2..cc95886d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21945&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21945&range=00-01

  Stats: 468676 lines in 6438 files changed: 232793 ins; 194970 del; 40913 mod
  Patch: https://git.openjdk.org/jdk/pull/21945.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21945/head:pull/21945

PR: https://git.openjdk.org/jdk/pull/21945