Fix TableGen code generation for ReadNone attribute.

Patch by Pete Abred!

llvm-svn: 243689
diff --git a/llvm/utils/TableGen/IntrinsicEmitter.cpp b/llvm/utils/TableGen/IntrinsicEmitter.cpp
index 18a8db6..cebe5bb 100644
--- a/llvm/utils/TableGen/IntrinsicEmitter.cpp
+++ b/llvm/utils/TableGen/IntrinsicEmitter.cpp
@@ -636,7 +636,7 @@
           case CodeGenIntrinsic::ReadNone:
             if (addComma)
               OS << ",";
-            OS << "Attributes::ReadNone";
+            OS << "Attribute::ReadNone";
             addComma = true;
             break;
           }