Sema/AST support for attribute used. Patch by Anders Johnson (with small tweaks & test case)!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64478 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/AttributeList.cpp b/lib/Parse/AttributeList.cpp
index 7f18a2c..56fd916 100644
--- a/lib/Parse/AttributeList.cpp
+++ b/lib/Parse/AttributeList.cpp
@@ -56,6 +56,7 @@
     if (!memcmp(Str, "weak", 4)) return AT_weak;
     if (!memcmp(Str, "pure", 4)) return AT_pure;
     if (!memcmp(Str, "mode", 4)) return AT_mode;
+    if (!memcmp(Str, "used", 4)) return AT_used;
     break;
   case 5:
     if (!memcmp(Str, "alias", 5)) return AT_alias;