Merge System into Support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp
index 6289f42..c628df0 100644
--- a/lib/Target/TargetData.cpp
+++ b/lib/Target/TargetData.cpp
@@ -25,7 +25,7 @@
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/System/Mutex.h"
+#include "llvm/Support/Mutex.h"
 #include "llvm/ADT/DenseMap.h"
 #include <algorithm>
 #include <cstdlib>