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

[Lance Andersen]

On Sat, 11 Sep 2021 12:11:50 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

Marked as reviewed by lancea (Reviewer).

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