De-bork CMake build

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92003 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/CMakeLists.txt b/lib/Support/CMakeLists.txt
index 0001aae..f1347f9 100644
--- a/lib/Support/CMakeLists.txt
+++ b/lib/Support/CMakeLists.txt
@@ -3,6 +3,7 @@
   APInt.cpp
   APSInt.cpp
   Allocator.cpp
+  circular_raw_ostream.cpp
   CommandLine.cpp
   ConstantRange.cpp
   Debug.cpp