RFR: 8378793: Add ResolvedFieldEntry is_valid assert [v4]

[David Holmes]

On Fri, 27 Feb 2026 17:15:12 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review this small change to add an assert for values in ResolvedFieldEntry, which was useful for debugging at one time.
>> Tested with tier1-3
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve assert message.

Updated version seems okay - thanks.

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/29943#pullrequestreview-3873805063