Merge System into Support.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120297 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 7de7d40..7fc2f6e 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -40,10 +40,10 @@
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Timer.h"
-#include "llvm/System/Mutex.h"
-#include "llvm/System/Program.h"
-#include "llvm/System/Signals.h"
-#include "llvm/System/Threading.h"
+#include "llvm/Support/Mutex.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/Threading.h"
 #include "llvm/Support/Compiler.h"
 
 using namespace clang;