Fix stupid oversight of missing #include.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3367 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Reader/ConstantReader.cpp b/lib/Bytecode/Reader/ConstantReader.cpp
index 88bfa34..df13360 100644
--- a/lib/Bytecode/Reader/ConstantReader.cpp
+++ b/lib/Bytecode/Reader/ConstantReader.cpp
@@ -10,6 +10,7 @@
 
 #include "ReaderInternals.h"
 #include "llvm/Module.h"
+#include "llvm/Constants.h"
 #include <algorithm>
 
 using std::make_pair;