RFR: 8373125: Add defensive screening of modifiers for Field and Parameter toString() results

[Chen Liang]

On Fri, 5 Dec 2025 05:14:05 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> The modifiers in core reflection and just modeled using the bits of an int. For methods and constructors, there are collisions on the reuse of modifier bits on different kinds of constructs. Printing misleading information is avoid by masking out the modfiers using information from the Modifer class.
> 
> While Field and Parameter don't currently have such collisions, they may under Valhalla and adding defensive screenings now would add robustness.

Looks right that we should continue to use `Modifer.xxxModifiers` to filter non-source modifier bits from access flags.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28672#pullrequestreview-3545707132