duplicate DataFlow implementation

Author: alexrford

ql/lib/codeql/ruby/DataFlow2.qll

@@ -0,0 +1,7 @@
+/**
+ * Provides classes for performing local (intra-procedural) and
+ * global (inter-procedural) data flow analyses.
+ */
+module DataFlow2 {
+  import codeql.ruby.dataflow.internal.DataFlowImpl2
+}