[mlir] Link with pthreads in AsyncRuntime

AsyncRuntime must be explicitly linked with LLVM pthreads

Reviewed By: mehdi_amini

Differential Revision: https://reviews.llvm.org/D89983

mlir/lib/ExecutionEngine/AsyncRuntime.cpp

@@ -59,7 +59,12 @@ mlirAsyncRuntimeAwaitToken(AsyncToken *token) {
 
 extern "C" MLIR_ASYNCRUNTIME_EXPORT void
 mlirAsyncRuntimeExecute(CoroHandle handle, CoroResume resume) {
+#if LLVM_ENABLE_THREADS
+  std::thread thread([handle, resume]() { (*resume)(handle); });
+  thread.detach();
+#else
   (*resume)(handle);
+#endif
 }
 
 extern "C" MLIR_ASYNCRUNTIME_EXPORT void

mlir/lib/ExecutionEngine/CMakeLists.txt

@@ -107,5 +107,6 @@ add_mlir_library(mlir_async_runtime
 
   LINK_LIBS PUBLIC
   mlir_c_runner_utils_static
+  ${LLVM_PTHREAD_LIB}
 )
 target_compile_definitions(mlir_async_runtime PRIVATE mlir_async_runtime_EXPORTS)