[MLIR] Apply clang-tidy fixes for llvm-qualified-auto in ConvertVectorToLLVM.cpp (NFC)

mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVM.cpp

diff --git a/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVM.cpp b/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVM.cpp
index d9f65ed..9fbac49 100644
--- a/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVM.cpp
+++ b/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVM.cpp
@@ -1853,7 +1853,7 @@
                                          "DeinterleaveOp not rank 1");
 
     if (resultType.isScalable()) {
-      auto llvmTypeConverter = this->getTypeConverter();
+      const auto *llvmTypeConverter = this->getTypeConverter();
       auto deinterleaveResults = deinterleaveOp.getResultTypes();
       auto packedOpResults =
           llvmTypeConverter->packOperationResults(deinterleaveResults);