Add missing #include's to cctype when using isdigit/alpha/etc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192519 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/examples/Kaleidoscope/Chapter3/toy.cpp b/examples/Kaleidoscope/Chapter3/toy.cpp
index 48cfbe6..0fb64e3 100644
--- a/examples/Kaleidoscope/Chapter3/toy.cpp
+++ b/examples/Kaleidoscope/Chapter3/toy.cpp
@@ -3,6 +3,7 @@
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#include <cctype>
 #include <cstdio>
 #include <map>
 #include <string>