Add 'AppendValue' to the list of magic CF function names that cause a tracked object to escape.  Fixes <rdar://problem/6560661>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63891 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/CFRefCount.cpp b/lib/Analysis/CFRefCount.cpp
index 8ed6bb2..ee17a57 100644
--- a/lib/Analysis/CFRefCount.cpp
+++ b/lib/Analysis/CFRefCount.cpp
@@ -826,7 +826,8 @@
         //
         ArgEffect E = (CStrInCStrNoCase(FName, "InsertValue") ||
                        CStrInCStrNoCase(FName, "AddValue") ||
-                       CStrInCStrNoCase(FName, "SetValue"))
+                       CStrInCStrNoCase(FName, "SetValue") ||
+                       CStrInCStrNoCase(FName, "AppendValue"))
                       ? MayEscape : DoNothing;
         
         S = getPersistentSummary(RetEffect::MakeNoRet(), DoNothing, E);