RFR: 8378793: Add ResolvedFieldEntry is_valid assert

[Coleen Phillimore]

On Thu, 26 Feb 2026 20:32:02 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

The ResolvedFieldEntry is invariant after being filled in.  Not sure why the is_valid() checks were added to the jvmti methods.  Will ask around but we can probably remove them.

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PR Comment: https://git.openjdk.org/jdk/pull/29943#issuecomment-3972999951