Implement attribute 'cf_returns_owned' (mirrors 'ns_returns_owned').

llvm-svn: 70952
diff --git a/clang/lib/Frontend/PCHWriter.cpp b/clang/lib/Frontend/PCHWriter.cpp
index a1f0cb7f..98ed063 100644
--- a/clang/lib/Frontend/PCHWriter.cpp
+++ b/clang/lib/Frontend/PCHWriter.cpp
@@ -1551,6 +1551,7 @@
     case Attr::ObjCNSObject:
     case Attr::CFOwnershipRelease:
     case Attr::CFOwnershipRetain:
+    case Attr::CFOwnershipReturns:
     case Attr::NSOwnershipRelease:
     case Attr::NSOwnershipRetain:
     case Attr::NSOwnershipReturns: