RFR: 8354541: Remove Shenandoah post barrier expand loop opts

[duke]

On Mon, 14 Apr 2025 18:42:23 GMT, Cesar Soares Lucas <cslucas at openjdk.org> wrote:

> Please review this patch to remove Shenandoah post-barrier expand loop optimizations. This optimization was added in the first iteration os Shenandoah barriers. Nowadays, we try to always insert LRB at the earliest place and the impact of these optimizations is minimal; they are also frequent source of bugs.
> 
> Tested on OSX Aarch64 & Linux amd64 with JTREG tier1-3.

@JohnTortugo 
Your change (at version bc1dbaf4c33f71745a3454c0789972b52117ed22) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/24630#issuecomment-2810192707