Rename the 'Attributes' class to 'Attribute'. It's going to represent a single attribute in the future.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170500 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/StmtPrinter.cpp b/lib/AST/StmtPrinter.cpp
index ff9039e..0c74149 100644
--- a/lib/AST/StmtPrinter.cpp
+++ b/lib/AST/StmtPrinter.cpp
@@ -1399,7 +1399,7 @@
       OS << ExceptionSpec;
     }
 
-    // FIXME: Attributes
+    // FIXME: Attribute
 
     // Print the trailing return type if it was specified in the source.
     if (Node->hasExplicitResultType())