[llvm] [ADT] Remove an obsolete forward declaration (NFC) (PR #156391)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

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.


---
Full diff: https://github.com/llvm/llvm-project/pull/156391.diff


1 Files Affected:

- (modified) llvm/include/llvm/ADT/PointerUnion.h (-3) 


``````````diff
diff --git a/llvm/include/llvm/ADT/PointerUnion.h b/llvm/include/llvm/ADT/PointerUnion.h
index 24caa960c718d..ca0e1ed3d49d1 100644
--- a/llvm/include/llvm/ADT/PointerUnion.h
+++ b/llvm/include/llvm/ADT/PointerUnion.h
@@ -88,9 +88,6 @@ namespace pointer_union_detail {
   };
 }
 
-// This is a forward declaration of CastInfoPointerUnionImpl
-// Refer to its definition below for further details
-template <typename... PTs> struct CastInfoPointerUnionImpl;
 /// A discriminated union of two or more pointer types, with the discriminator
 /// in the low bit of the pointer.
 ///

``````````

</details>


https://github.com/llvm/llvm-project/pull/156391