RFR: 8333047: Remove arena-size-workaround in jvmtiUtils.cpp

[Thomas Stuefe]

In `JvmtiUtil::single_threaded_resource_area()`, we create a resource area that is supposed to work even if the current thread is not attached yet and there is no associated Thread or the Thread has no valid ResourceArea.

It contains a workaround:


    // lazily create the single threaded resource area
    // pick a size which is not a standard since the pools don't exist yet
    _single_threaded_resource_area = new (mtInternal) ResourceArea(Chunk::non_pool_size);


It specifies a non-standard chunk size to circumvent the chunk-pool-based allocation in the RA constructor, ensuring that only malloc is used. This is because in the old days the ChunkPools had been allocated from C-Heap and there was a time window when no chunk pools were live yet.

This is quirky and a bit ugly. It is also unnecessary since [JDK-8272112](https://bugs.openjdk.org/browse/JDK-8272112) (since JDK 18). We now create chunk pools as global objects, so they are live as soon as the libjvm C++ initialization ran. We can remove this workaround and the comment.

---

Tests: GHAs.
I also manually called this function, and allocated from the resulting ResourceArea, at the very beginning of CreateJavaVM. I made sure that both allocations and follow-up-chunk-allocation worked even this early in VM life.

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Commit messages:
 - copyrights
 - remove non_pool_size
 - start

Changes: https://git.openjdk.org/jdk/pull/19425/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19425&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333047
  Stats: 8 lines in 3 files changed: 0 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/19425.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19425/head:pull/19425

PR: https://git.openjdk.org/jdk/pull/19425