[mlir] Apply ClangTidy performance finding

- Use '\n' instead of std::endl;

https://clang.llvm.org/extra/clang-tidy/checks/performance/avoid-endl.html

Author: akuegel

mlir/include/mlir/ExecutionEngine/RunnerUtils.h

@@ -217,14 +217,14 @@ void printMemRefShape(UnrankedMemRefType<T> &m) {
 template <typename T>
 void printMemRef(const DynamicMemRefType<T> &m) {
   printMemRefMetaData(std::cout, m);
-  std::cout << " data = " << std::endl;
+  std::cout << " data = \n";
   if (m.rank == 0)
     std::cout << "[";
   MemRefDataPrinter<T>::print(std::cout, m.data, m.rank, m.rank, m.offset,
                               m.sizes, m.strides);
   if (m.rank == 0)
     std::cout << "]";
-  std::cout << std::endl;
+  std::cout << '\n';
 }
 
 template <typename T, int N>