RFR: 8334421: assert(!oldbox->is_unbalanced()) failed: this should not be called for unbalanced region

[Tobias Hartmann]

On Mon, 24 Jun 2024 23:22:34 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> [JDK-8324969](https://bugs.openjdk.org/browse/JDK-8324969) changes was not complete. When Escape Analysis tries to determine if lock can be eliminated it looks only if corresponding object does not escape. I does not take into account if coarsening locks elimination already happened and created unbalanced regions.
> 
> Added check that not-escaped object is not referenced from an unbalanced region before marking or eliminating corresponding locks.
> 
> Dump additional information for coarsened locks when debugging.
> 
> New regression test was added
> 
> Tested tier1-5,stress,xcomp

Looks good to me too.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19870#pullrequestreview-2137448660