Merge System into Support.

llvm-svn: 120298
diff --git a/llvm/lib/Support/ManagedStatic.cpp b/llvm/lib/Support/ManagedStatic.cpp
index 4e655a0..c767c15 100644
--- a/llvm/lib/Support/ManagedStatic.cpp
+++ b/llvm/lib/Support/ManagedStatic.cpp
@@ -13,7 +13,7 @@
 
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Config/config.h"
-#include "llvm/System/Atomic.h"
+#include "llvm/Support/Atomic.h"
 #include <cassert>
 using namespace llvm;