Fix the use of sys::MemoryFence after including WindowsSupport.h that
r271558 introduced.
llvm-svn: 271563
diff --git a/llvm/lib/Support/Threading.cpp b/llvm/lib/Support/Threading.cpp
index a4e1e44..de2ff6b 100644
--- a/llvm/lib/Support/Threading.cpp
+++ b/llvm/lib/Support/Threading.cpp
@@ -72,6 +72,11 @@
#include "Windows/WindowsSupport.h"
#include <process.h>
+// Windows will at times define MemoryFence.
+#ifdef MemoryFence
+#undef MemoryFence
+#endif
+
struct ThreadInfo {
void (*func)(void*);
void *param;