Merge System into Support.

llvm-svn: 120298
diff --git a/llvm/lib/MC/MCDisassembler/EDDisassembler.h b/llvm/lib/MC/MCDisassembler/EDDisassembler.h
index e2f850b..fdbe7ad 100644
--- a/llvm/lib/MC/MCDisassembler/EDDisassembler.h
+++ b/llvm/lib/MC/MCDisassembler/EDDisassembler.h
@@ -21,7 +21,7 @@
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/System/Mutex.h"
+#include "llvm/Support/Mutex.h"
 
 #include <map>
 #include <set>