RFR: ThreadSnapshot: create objects in VM

[duke]

On Wed, 30 Apr 2025 18:24:24 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> The change removes upcalls to ThreadLock and ThreadSnapshot ctors, allocates and fills objects in the VM

@alexmenkov 
Your change (at version ff5c7f6e3453131dc53f7c4f935590aa313a0d32) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/loom/pull/218#issuecomment-2845320700