attempt to unbreak build after r281254

llvm-svn: 281262

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/RPCSerialization.h b/llvm/include/llvm/ExecutionEngine/Orc/RPCSerialization.h
index fdba8b9..c1d346b 100644 (file)
--- a/llvm/include/llvm/ExecutionEngine/Orc/RPCSerialization.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/RPCSerialization.h
@@ -11,6 +11,7 @@
 #define LLVM_EXECUTIONENGINE_ORC_RPCSERIALIZATION_H
 
 #include "OrcError.h"
+#include <mutex>
 #include <sstream>
 #include <thread>