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


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70952 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHWriter.cpp b/lib/Frontend/PCHWriter.cpp
index a1f0cb7..98ed063 100644
--- a/lib/Frontend/PCHWriter.cpp
+++ b/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: