RFR: 8268358: [lworld] toString for primitive class should return `ClassName at hash`

[Mandy Chung]

On Tue, 8 Jun 2021 19:55:46 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> `Object::toString` implementation of a primitive class should return the traditional `ClassName at hash` (rather than listing the field values) not to leak any private and security-sensitive information.   A primitive class can override `toString` implementation for their custom string representation.

This is the default implementation of `Object::toString`.   If one wants a class to use secure hash, they can override the `hashCode` method.

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PR: https://git.openjdk.java.net/valhalla/pull/438