Unbreak cmake build.

llvm-svn: 116003
diff --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index 25fce71..f7e02c9 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -35,6 +35,7 @@
   SystemUtils.cpp
   TargetRegistry.cpp
   Timer.cpp
+  ToolOutputFile.cpp
   Triple.cpp
   Twine.cpp
   raw_os_ostream.cpp