[code-reflection] Integrated: Moved some 'util' helpers into nested phase classes

[Gary Frost]

On Sat, 27 Dec 2025 17:37:58 GMT, Gary Frost <gfrost at openjdk.org> wrote:

> Moved sealed class heirarchy into nested classes (Ops and Phases) and moves util classes to the appropriate level of nesting

This pull request has now been integrated.

Changeset: f30774b0
Author:    Gary Frost <gfrost at openjdk.org>
URL:       https://git.openjdk.org/babylon/commit/f30774b08e21a408b73fa314dfad6e1603125b82
Stats:     4143 lines in 59 files changed: 1366 ins; 2557 del; 220 mod

Moved some 'util' helpers into nested phase classes

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PR: https://git.openjdk.org/babylon/pull/793