[ADT] Remove an obsolete forward declaration (NFC) (#156391) We just removed CastInfoPointerUnionImpl in: commit 2d216a94f3c84037cdfb3fa5def9efb020a88537 Author: Kazu Hirata <kazu@google.com> Date: Mon Sep 1 08:04:49 2025 -0700 This patch removes the obsolete forward declaration.
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