RFR: 8281631: HashMap.putAll can cause redundant space waste

[stefan-zobel]

On Thu, 10 Feb 2022 18:09:19 GMT, XenoAmess <duke at openjdk.java.net> wrote:

> I investigated most of the usages. They just give a size, and get a capacity, even not change the 0.75 So maybe we can use some int calculation to replace the 0.75, thus replace Math.ceil for such situations.

FWIW, `(int) Math.ceil(expected / 0.75)` and `(int) ((expected * 4L + 2L) / 3L)` would be equivalent.

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