RFR: 8367859: Remove nio exception gensrc

[Alan Bateman]

On Wed, 17 Sep 2025 18:57:45 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> An alternative implementation to https://github.com/openjdk/jdk/pull/27338, which removes the entire gensrc stage and instead permanently checks in the generated Java files.

Can you confirm that tier1 + tier2 are passing? (most of the tests are in tier2).

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PR Comment: https://git.openjdk.org/jdk/pull/27352#issuecomment-3308284366