[code-reflection] Integrated: Fix up experiment module. Also autogen config.h

[Gary Frost]

On Sat, 21 Jun 2025 09:55:03 GMT, Gary Frost <gfrost at openjdk.org> wrote:

> I had missed some import issues in the 'experiments' module. This PR fixes those. 
> 
> Also we now autogen config.h from java side.

This pull request has now been integrated.

Changeset: a40d414e
Author:    Gary Frost <gfrost at openjdk.org>
URL:       https://git.openjdk.org/babylon/commit/a40d414ee1e5b53589aef00d9d45de61379d4960
Stats:     637 lines in 25 files changed: 470 ins; 110 del; 57 mod

Fix up experiment module. Also autogen config.h

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PR: https://git.openjdk.org/babylon/pull/455