RFR: 8348909: [BACKOUT] Implement a better allocator for downcalls

[Chen Liang]

On Fri, 31 Jan 2025 15:01:08 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> This reverts https://github.com/openjdk/jdk/pull/23142
> 
> See the JBS issue. It seems that the changes are occasionally causing heap corruption, potentially due to use after free, which occasionally results in corrupt malloc headers being caught on mac. This failure was observed once in about 500 runs of this test, so it is quite intermittent.
> 
> Backing this change out seems the easiest/safest to clear up the tier 1 failure, until we've had a chance to investigate the issue further.

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/23391#pullrequestreview-2587275589