RFR: 8324573: HashMap::putAll should resize to sum of both map sizes

[Joshua Cao]

On Wed, 24 Jan 2024 23:53:34 GMT, jmehrens <duke at openjdk.org> wrote:

> For any Map/Collection you can fetch the Spliterator and use estimateSize or getExactSizeIfKnown as both return size as a long.

Based on the code, I think this will just return the original size. It would be the same as casting `(long) size()`.

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PR Comment: https://git.openjdk.org/jdk/pull/17544#issuecomment-1909145170