[mlir][MemRef] Apply ClangTidy performance fix (NFC).

diff --git a/mlir/lib/Dialect/MemRef/Transforms/RuntimeOpVerification.cpp b/mlir/lib/Dialect/MemRef/Transforms/RuntimeOpVerification.cpp
index 101325e..002e5f1 100644 (file)
--- a/mlir/lib/Dialect/MemRef/Transforms/RuntimeOpVerification.cpp
+++ b/mlir/lib/Dialect/MemRef/Transforms/RuntimeOpVerification.cpp
@@ -26,7 +26,8 @@ struct ExpandShapeOpInterface
 
     // Verify that the expanded dim sizes are a product of the collapsed dim
     // size.
-    for (auto it : llvm::enumerate(expandShapeOp.getReassociationIndices())) {
+    for (const auto &it :
+         llvm::enumerate(expandShapeOp.getReassociationIndices())) {
       Value srcDimSz =
           builder.create<DimOp>(loc, expandShapeOp.getSrc(), it.index());
       int64_t groupSz = 1;