Add missing cctype includes.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161660 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/ClangDiagnosticsEmitter.cpp b/utils/TableGen/ClangDiagnosticsEmitter.cpp
index e503cb5..8e7f454 100644
--- a/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ b/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -21,6 +21,7 @@
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/TableGenBackend.h"
 #include <algorithm>
+#include <cctype>
 #include <functional>
 #include <map>
 #include <set>