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 reminds me [JDK-8201462](https://bugs.openjdk.java.net/browse/JDK-8201462).

FWIW the current implementation already adds the randomness to
the hash code computation with a constant random 32-bit “salt” 
configured at startup but it still carries the `31*x+` pattern which 
should be cleaned up.

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