Update CMake build.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119741 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/CMakeLists.txt b/lib/Basic/CMakeLists.txt
index 3f737e7..f7dd8c1 100644
--- a/lib/Basic/CMakeLists.txt
+++ b/lib/Basic/CMakeLists.txt
@@ -4,6 +4,7 @@
   Builtins.cpp
   ConvertUTF.c
   Diagnostic.cpp
+  DiagnosticIDs.cpp
   FileManager.cpp
   IdentifierTable.cpp
   SourceLocation.cpp