Apply changes to sync with llvm upstream.
diff --git a/lib/ExecutionEngine/ContextManager.h b/lib/ExecutionEngine/ContextManager.h
index 98cddfe..f23c4a1 100644
--- a/lib/ExecutionEngine/ContextManager.h
+++ b/lib/ExecutionEngine/ContextManager.h
@@ -19,7 +19,7 @@
 
 #include <Config.h>
 
-#include <llvm/System/Mutex.h>
+#include <llvm/Support/Mutex.h>
 
 #include <unistd.h>
 #include <stddef.h>