[llvm] [GlobalISel] Combine G_UNMERGE_VALUES with anyext and build vector (PR #112370)

[Thorsten Schütt via llvm-commits]

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@@ -868,6 +868,14 @@ class GZext : public GCastOp {
   };
 };
 
+/// Represents an any ext.
+class GAnyExt : public GCastOp {
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tschuett wrote:

`CastOp` already has `G_ANYZEXT` or why misunderstood your comment. 

https://github.com/llvm/llvm-project/pull/112370