Add world's longest matcher to capture retinanet "filter"

Used to capture the input of the data from the reshape, to the greater operation
taken via indices. Should capture things via

gatherND <-reshape <- data
        \<-transpose <-nonzero <- greater <- indicies

src/simplify_reshapes.cpp

@@ -496,13 +496,16 @@ struct find_nonzero_gathernd_filter
     auto matcher() const
     {
         return match::name("gathernd")(
-            match::args((match::arg(1)(match::name("transpose").bind("data")))));
+            match::args(match::name("reshape").bind("data"),
+                        match::name("transpose")(match::args(match::arg(0)(match::name("nonzero")(
+                            match::args(match::arg(0)(match::name("greater").bind("ind")))))))));
     }
 
-    void apply(module &m, const match::matcher_result& r) const
+    void apply(module& m, const match::matcher_result& r) const
     {
-        auto ins     = r.result;
-        auto reshape = r.instructions["data"];
+        auto ins         = r.result;
+        auto data_input  = r.instructions["data"];
+        auto index_input = r.instructions["ind"];
 
         std::cout << "Beep" << std::endl;
     }