Add clang support for IBOutletCollection.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104135 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/PCHWriter.cpp b/lib/Frontend/PCHWriter.cpp
index 88d1972..f8415cd 100644
--- a/lib/Frontend/PCHWriter.cpp
+++ b/lib/Frontend/PCHWriter.cpp
@@ -1917,6 +1917,12 @@
     case Attr::NoThrow:
       break;
 
+    case Attr::IBOutletCollectionKind: {
+      const IBOutletCollectionAttr *ICA = cast<IBOutletCollectionAttr>(Attr);
+      AddDeclRef(ICA->getClass(), Record);
+      break;
+    }
+
     case Attr::NonNull: {
       const NonNullAttr *NonNull = cast<NonNullAttr>(Attr);
       Record.push_back(NonNull->size());