Add sema support for the cleanup attribute.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63462 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/AttributeList.cpp b/lib/Parse/AttributeList.cpp
index 6c1583a..477d6e3 100644
--- a/lib/Parse/AttributeList.cpp
+++ b/lib/Parse/AttributeList.cpp
@@ -73,6 +73,7 @@
     if (!memcmp(Str, "nonnull", 7)) return AT_nonnull;
     if (!memcmp(Str, "objc_gc", 7)) return AT_objc_gc;
     if (!memcmp(Str, "stdcall", 7)) return AT_stdcall;
+    if (!memcmp(Str, "cleanup", 7)) return AT_cleanup;
     break;
   case 8:
     if (!memcmp(Str, "annotate", 8)) return AT_annotate;