Fix CMake build for AST XML dumper

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72228 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/CMakeLists.txt b/lib/Frontend/CMakeLists.txt
index 241cf5c..649f9da 100644
--- a/lib/Frontend/CMakeLists.txt
+++ b/lib/Frontend/CMakeLists.txt
@@ -7,6 +7,7 @@
   CacheTokens.cpp
   DependencyFile.cpp
   DiagChecker.cpp
+  DocumentXML.cpp
   FixItRewriter.cpp
   GeneratePCH.cpp
   HTMLDiagnostics.cpp
@@ -27,6 +28,7 @@
   RewriteMacros.cpp
   RewriteObjC.cpp
   RewriteTest.cpp
+  StmtXML.cpp
   TextDiagnosticBuffer.cpp
   TextDiagnosticPrinter.cpp
   Warnings.cpp