When someone includes CallGraph.h, make sure that they link in CallGraph.cpp


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9611 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/IPA/CallGraph.cpp b/lib/Analysis/IPA/CallGraph.cpp
index 59fd1a2..f5be91c 100644
--- a/lib/Analysis/IPA/CallGraph.cpp
+++ b/lib/Analysis/IPA/CallGraph.cpp
@@ -316,3 +316,4 @@
   return F;
 }
 
+void CallGraph::stub() {}