RFR: 8186958: Need method to create pre-sized HashMap [v3]

[XenoAmess]

On Thu, 24 Mar 2022 00:44:02 GMT, liach <duke at openjdk.java.net> wrote:

> Note that the methods may have to go to somewhere else in `java.util` if `Collections` cannot be loaded too early during startup, as HashMap is loaded very early

I'm afraid you are correct... moved the calculation function into HashMap seems better.

@liach done.

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