RFR: 8283801: Cleanup confusing String.toString calls

[Andrey Turbanov]

On Sun, 20 Mar 2022 13:20:31 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> String.toString() calls doesn't make much sense. Only one place, where it could be used - to generate NPE. But in a few places of JDK codebase it's called, even when NPE will happen anyway.
> I propose to cleanup such places.
> Found by IntelliJ IDEA inspection `Redundant 'String' operation`.

Thank you for review!

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PR: https://git.openjdk.java.net/jdk/pull/7878