Semantics of @protocol attributes.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61114 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/AttributeList.cpp b/lib/Parse/AttributeList.cpp
index 342c87f..0a418bb 100644
--- a/lib/Parse/AttributeList.cpp
+++ b/lib/Parse/AttributeList.cpp
@@ -94,6 +94,7 @@
   case 11:
     if (!memcmp(Str, "vector_size", 11)) return AT_vector_size;
     if (!memcmp(Str, "constructor", 11)) return AT_constructor;
+    if (!memcmp(Str, "unavailable", 11)) return AT_unavailable;
     break;
   case 13:
     if (!memcmp(Str, "address_space", 13)) return AT_address_space;