[llvm] [DAGCombiner] Add combine for vector interleave of splats (PR #151110)

[Luke Lau via llvm-commits]

================
@@ -331,6 +331,11 @@ namespace {
       return CombineTo(N, To, 2, AddTo);
     }
 
+    SDValue CombineTo(SDNode *N, SmallVectorImpl<SDValue> *To,
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lukel97 wrote:

Could this be 
```suggestion
    SDValue CombineTo(SDNode *N, ArrayRef<SDValue> *To,
```

https://github.com/llvm/llvm-project/pull/151110