[code-reflection] Integrated: Simplifying InvokePtr example

[Gary Frost]

On Mon, 1 Jul 2024 12:00:52 GMT, Gary Frost <gfrost at openjdk.org> wrote:

> Some mildly cosmetic changes to InvokePtr expermental code, in prep for Schema and HatPtr work
> 
> Created a common interface type Builder, Builder.StructChild an Builder.UnionChild all extend MappableIface

This pull request has now been integrated.

Changeset: 9c677be9
Author:    Gary Frost <gfrost at openjdk.org>
URL:       https://git.openjdk.org/babylon/commit/9c677be9adb763972854d4aa0a27ce4b5efdaee7
Stats:     567 lines in 7 files changed: 102 ins; 311 del; 154 mod

Simplifying InvokePtr example

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PR: https://git.openjdk.org/babylon/pull/166