add a missing #include

llvm-svn: 49256
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 0a561d7..16a745c 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -16,6 +16,7 @@
 #include "clang/AST/Builtins.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/STLExtras.h"
+#include <cstdlib>
 using namespace clang;
 
 // TargetInfo Constructor.