RFR: 8186958: Need method to create pre-sized HashMap [v18]

[Naoto Sato]

On Thu, 14 Apr 2022 18:32:03 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>>> Good point! Filed an issue: https://bugs.openjdk.java.net/browse/JDK-8284856
>> 
>> @stuart-marks @naotoj I can help solve JDK-8284856 after this pr. But usually we only solve 1 issue in 1 pr, so I think it's better to wait after this.
>
> Thanks. Will fix it myself, as I want to eliminate that immediate value in the code.

PR opened, based on this PR.
https://github.com/openjdk/jdk/pull/8253

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PR: https://git.openjdk.java.net/jdk/pull/7928