RFR: 8281631: HashMap copy constructor and putAll can over-allocate table [v25]

[XenoAmess]

On Fri, 4 Mar 2022 17:43:25 GMT, liach <duke at openjdk.java.net> wrote:

> nitpick for the test code: for better performance, move method handle and var handle to static final fields so the jvm can run faster

will do it when we really migrate this test, but it should be done in another pr when I add WeakHashMap's table's delay creation mechenism.

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PR: https://git.openjdk.java.net/jdk/pull/7431