[mlir] Apply ClangTidy performance fix

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

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

Author: akuegel

mlir/lib/ExecutionEngine/AsyncRuntime.cpp

@@ -446,7 +446,7 @@ extern "C" int64_t mlirAsyncRuntimGetNumWorkerThreads() {
 
 extern "C" void mlirAsyncRuntimePrintCurrentThreadId() {
   static thread_local std::thread::id thisId = std::this_thread::get_id();
-  std::cout << "Current thread id: " << thisId << std::endl;
+  std::cout << "Current thread id: " << thisId << '\n';
 }
 
 //===----------------------------------------------------------------------===//

mlir/lib/ExecutionEngine/SparseTensorRuntime.cpp

@@ -450,10 +450,10 @@ void _mlir_ciface_outSparseTensorWriterMetaData(
   assert(dimRank != 0);
   index_type *dimSizes = MEMREF_GET_PAYLOAD(dimSizesRef);
   std::ostream &file = *static_cast<std::ostream *>(p);
-  file << dimRank << " " << nse << std::endl;
+  file << dimRank << " " << nse << '\n';
   for (index_type d = 0; d < dimRank - 1; d++)
     file << dimSizes[d] << " ";
-  file << dimSizes[dimRank - 1] << std::endl;
+  file << dimSizes[dimRank - 1] << '\n';
 }
 
 #define IMPL_OUTNEXT(VNAME, V)                                                 \
@@ -468,7 +468,7 @@ void _mlir_ciface_outSparseTensorWriterMetaData(
     for (index_type d = 0; d < dimRank; d++)                                   \
       file << (dimCoords[d] + 1) << " ";                                       \
     V *value = MEMREF_GET_PAYLOAD(vref);                                       \
-    file << *value << std::endl;                                               \
+    file << *value << '\n';                                                    \
   }
 MLIR_SPARSETENSOR_FOREVERY_V(IMPL_OUTNEXT)
 #undef IMPL_OUTNEXT