RFR: 8256237: Zero: non-PCH build fails after JDK-8253064

[Aleksey Shipilev]

This shows up in GH actions, and reproduces locally:



   42 | Handle thread_group (THREAD, Universe::system_thread_group());
      | ^~~~~~~~
Attention @dcubed-ojdk ;)

Testing:
 - [x] Local Linux x86_64 Zero fastdebug build

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

Commit messages:
 - 8256237: Zero: non-PCH build fails after JDK-8253064

Changes: https://git.openjdk.java.net/jdk/pull/1174/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1174&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256237
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1174.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1174/head:pull/1174

PR: https://git.openjdk.java.net/jdk/pull/1174