RFR: 8362203: assert(state == nullptr || state->get_thread_oop() != nullptr) failed: incomplete state

[Leonid Mesnik]

The problem happens if post_early_vm_start is triggered.
The fix is to complete initialization once threadObj become available.

I'vent observed that recompute_enable and hitting assertion might happens before this step. However it might be makes sense to check state in assertion if needed.

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Commit messages:
 - fixed comments after feedback, some polishing
 - 8362203: assert(state == nullptr || state->get_thread_oop() != nullptr) failed: incomplete state

Changes: https://git.openjdk.org/jdk/pull/26303/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26303&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362203
  Stats: 19 lines in 4 files changed: 17 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26303.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26303/head:pull/26303

PR: https://git.openjdk.org/jdk/pull/26303