CMake: Added some source files.

Patch contributed by Jay Foad!

llvm-svn: 59656
diff --git a/clang/lib/AST/CMakeLists.txt b/clang/lib/AST/CMakeLists.txt
index 4ac6a6e..c49a0ee 100644
--- a/clang/lib/AST/CMakeLists.txt
+++ b/clang/lib/AST/CMakeLists.txt
@@ -1,6 +1,7 @@
 set(LLVM_NO_RTTI 1)
 
 add_clang_library(clangAST
+  APValue.cpp
   ASTConsumer.cpp
   ASTContext.cpp
   Builtins.cpp