RFR: 8314258: checked_cast doesn't properly check some cases [v4]

[Stefan Karlsson]

On Sun, 15 Feb 2026 17:23:52 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Please review this addition of the `integer_cast` utility.
>> 
>> Details in first comment, to avoid email spamming from automatic messages.
>> 
>> Testing: mach5 tier1-5 with `checked_cast` for integral types changed to call
>> the new `integer_cast`.  Addition of `integer_cast` includes gtests.
>
> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove comments about compiler optimization expectations

The updates looks good to me. Thanks.

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Marked as reviewed by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29582#pullrequestreview-3807524907