Do not use typeinfo to identify pass in pass manager.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36632 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/UnifyFunctionExitNodes.cpp

@@ -22,6 +22,7 @@
 #include "llvm/Type.h"
 using namespace llvm;
 
+const int UnifyFunctionExitNodes::ID = 0;
 static RegisterPass<UnifyFunctionExitNodes>
 X("mergereturn", "Unify function exit nodes");