[ORC] Add a missing #include atomic.

Hopefully this will fix the bot build failures from r371245.

llvm-svn: 371255

diff --git a/llvm/unittests/ExecutionEngine/Orc/QueueChannel.h b/llvm/unittests/ExecutionEngine/Orc/QueueChannel.h
index 1909693..caf6969 100644 (file)
--- a/llvm/unittests/ExecutionEngine/Orc/QueueChannel.h
+++ b/llvm/unittests/ExecutionEngine/Orc/QueueChannel.h
@@ -12,6 +12,7 @@
 #include "llvm/ExecutionEngine/Orc/RawByteChannel.h"
 #include "llvm/Support/Error.h"
 
+#include <atomic>
 #include <condition_variable>
 #include <queue>