RFR: 8366229: runtime/Thread/TooSmallStackSize.java runs with all collectors

[Paul Hübner]

Hi all,

This change forces the `TooSmallStackSize.java` test to run on flagless VMs. Previously, this could get influenced by GC choice, whose flags were never propagated to the subprocess.

Testing: tier 1.

N.B.: Please ignore my fork's branch name, I copied and pasted the wrong ID.

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Commit messages:
 - Require flagless VM for TooSmallStackSize.java.

Changes: https://git.openjdk.org/jdk/pull/27297/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27297&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366229
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27297.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27297/head:pull/27297

PR: https://git.openjdk.org/jdk/pull/27297