[ORC] Fix a missing include in r343055.

llvm-svn: 343056

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/ThreadSafeModule.h b/llvm/include/llvm/ExecutionEngine/Orc/ThreadSafeModule.h
index c82fb98..435723d 100644 (file)
--- a/llvm/include/llvm/ExecutionEngine/Orc/ThreadSafeModule.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/ThreadSafeModule.h
@@ -17,6 +17,8 @@
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 
+#include <mutex>
+
 namespace llvm {
 namespace orc {