Unbreak the CMake builds following the CallGraph change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151952 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Index/CMakeLists.txt b/lib/Index/CMakeLists.txt
index 0a3f7cb..9bf35e5 100644
--- a/lib/Index/CMakeLists.txt
+++ b/lib/Index/CMakeLists.txt
@@ -3,7 +3,7 @@
 add_clang_library(clangIndex
   ASTLocation.cpp
   Analyzer.cpp
-  CallGraph.cpp
+  GlobalCallGraph.cpp
   DeclReferenceMap.cpp
   Entity.cpp
   GlobalSelector.cpp