Fix build to work with LLVM top-of-tree again

parse.yy

@@ -83,7 +83,11 @@ struct ForeachDimension;
 #include "util.h"
 
 #include <stdio.h>
-#include <llvm/Constants.h>
+#if !defined(LLVM_3_0) && !defined(LLVM_3_1) && !defined(LLVM_3_2)
+  #include <llvm/IR/Constants.h>
+#else
+  #include <llvm/Constants.h>
+#endif
 
 #define UNIMPLEMENTED \
         Error(yylloc, "Unimplemented parser functionality %s:%d", \