RFR: 8348268: Test gc/shenandoah/TestResizeTLAB.java#compact: fatal error: Before Updating References: Thread C2 CompilerThread1: expected gc-state 9, actual 21 [v3]

[William Kemper]

> Non-java threads were not having their gc-state configured when they attach. If they were created before the verifier's safepoint, but after the iteration over non-java threads, they would not have the correct state.

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Update comments, add an assertion

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23428/files
  - new: https://git.openjdk.org/jdk/pull/23428/files/1a4e3bb1..c57bf8a0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23428&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23428&range=01-02

  Stats: 11 lines in 1 file changed: 6 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23428.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23428/head:pull/23428

PR: https://git.openjdk.org/jdk/pull/23428