RFR: 8274811: Remove superfluous use of boxing in java.base

[Сергей Цыпанов]

On Sat, 27 Nov 2021 17:41:58 GMT, Andrey Turbanov <duke at openjdk.java.net> wrote:

>> Usages of primitive types should be preferred and makes code easier to read.
>> Similar cleanups:
>> 1. [JDK-8273168](https://bugs.openjdk.java.net/browse/JDK-8273168) java.desktop
>> 2. [JDK-8274234](https://bugs.openjdk.java.net/browse/JDK-8274234) java.sql.rowset
>
> let's wait for review a bit more

@turbanoff I think now you can integrate the PR

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PR: https://git.openjdk.java.net/jdk/pull/5481