Added dataflow module

lib/miniImp/definedVariables.mli

@@ -0,0 +1,15 @@
+open Analysis
+
+module Variable : sig
+  type t
+  val pp : out_channel -> t -> unit
+end
+
+module RISCCfg = CfgRISC.RISCCfg
+
+module DVCfg : Dataflow.C with type elt = CfgRISC.RISCSimpleStatements.t
+                           and type internal = Variable.t
+
+val compute_defined_variables : RISCCfg.t -> DVCfg.t
+
+val compute_cfg : DVCfg.t -> RISCCfg.t