RFR: 8312121: Fix -Wconversion warnings in tribool.hpp [v4]

[Dean Long]

On Wed, 26 Jul 2023 03:51:26 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Is the `& 3` still needed with the extra u1 cast? I'm gonna guess yes as a u1 doesn't fit in a uchar:2 any better than a uint does.

Good question.  I got this to work:

`_value = ((u1)newval | 2u);`

but it requires gcc 11.3.

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PR Comment: https://git.openjdk.org/jdk/pull/14892#issuecomment-1650975096