[mlir][vector] Sink vector.extract/splat into load/store ops (#134389)

```
vector.load %arg0[%arg1] : memref<?xf32>, vector<4xf32>
vector.extract %0[1] : f32 from vector<4xf32>
```
Gets converted to:
```
%c1 = arith.constant 1 : index
%0 = arith.addi %arg1, %c1 overflow<nsw> : index
%1 = memref.load %arg0[%0] : memref<?xf32>
```

```
%0 = vector.splat %arg2 : vector<1xf32>
vector.store %0, %arg0[%arg1] : memref<?xf32>, vector<1xf32>
```
Gets converted to:
```
memref.store %arg2, %arg0[%arg1] : memref<?xf32>
```

1 files changed, 1 insertions, 0 deletions

diff --git a/mlir/test/lib/Dialect/Vector/TestVectorTransforms.cpp b/mlir/test/lib/Dialect/Vector/TestVectorTransforms.cpp
index a54ae816570a..03f907e46c2c 100644
--- a/mlir/test/lib/Dialect/Vector/TestVectorTransforms.cpp
+++ b/mlir/test/lib/Dialect/Vector/TestVectorTransforms.cpp
@@ -395,6 +395,7 @@ struct TestVectorSinkPatterns
   void runOnOperation() override {
     RewritePatternSet patterns(&getContext());
     populateSinkVectorOpsPatterns(patterns);
+    populateSinkVectorMemOpsPatterns(patterns);
     (void)applyPatternsGreedily(getOperation(), std::move(patterns));
   }
 };