Merge System into Support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-prof/llvm-prof.cpp b/tools/llvm-prof/llvm-prof.cpp
index 1c63d97..3351bd2 100644
--- a/tools/llvm-prof/llvm-prof.cpp
+++ b/tools/llvm-prof/llvm-prof.cpp
@@ -29,7 +29,7 @@
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Format.h"
-#include "llvm/System/Signals.h"
+#include "llvm/Support/Signals.h"
 #include <algorithm>
 #include <iomanip>
 #include <map>