RFR: 8279986: methods Math::asXExact for safely checked primitive casts

[Michael Hixson]

On Thu, 5 May 2022 10:11:05 GMT, Raffaello Giulietti <duke at openjdk.java.net> wrote:

> Add a family of "safe" cast methods.

This PR also solves [JDK-8154433](https://bugs.openjdk.java.net/browse/JDK-8154433), though you went the other way on -0.0.

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PR: https://git.openjdk.java.net/jdk/pull/8548