RFR: 8371164: ArrayList.addAll() optimizations

[jengebr]

On Tue, 4 Nov 2025 10:29:53 GMT, Pavel Rappo <prappo at openjdk.org> wrote:

>  Also, there is slight a mismatch between the title and the contents of the PR: it's not only about ArrayList

This is a bit of a grey area - it's not only about ArrayList, rather it's only about ArrayList.addAll().  One of the improvements is to the method itself, another is to the critical downstream method.  This is demonstrated by the benchmark, which only calls ArrayList.addAll().

I'd rather leave it as-is since it describes the purpose of the optimization.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28116#discussion_r2490658415