Include cctype for isdigit.  Patch by Stephen Hines.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151973 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Linker/LinkModules.cpp b/lib/Linker/LinkModules.cpp
index 8af2c88..f19e6e3 100644
--- a/lib/Linker/LinkModules.cpp
+++ b/lib/Linker/LinkModules.cpp
@@ -24,6 +24,7 @@
 #include "llvm/Support/Path.h"
 #include "llvm/Transforms/Utils/Cloning.h"
 #include "llvm/Transforms/Utils/ValueMapper.h"
+#include <cctype>
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//