[llvm] [ARM] Add combine for vector_interleave operation (PR #225818)

[David Green via llvm-commits]

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@@ -16977,6 +16977,146 @@ static SDValue PerformExtractFpToIntStores(StoreSDNode *St, SelectionDAG &DAG) {
   return Store;
 }
 
+// Combine stores of all VECTOR_INTERLEAVE results into a structured store
+// (vstN) when they access consecutive memory. Running this after type legalization
+// let wider vector types to be splitted into legal types, so each split can form
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davemgreen wrote:

to be splitted -> be split.
can form structured store -> can form a structured store

https://github.com/llvm/llvm-project/pull/225818