Use ICData to collect type feedback on instance setter value. If value is always Smi, insert a smi …

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
===================================================================
--- runtime/vm/flow_graph_builder.cc	(revision 12244)
+++ runtime/vm/flow_graph_builder.cc	(working copy)
@@ -1956,7 +1956,7 @@
                                                   Token::kSET,
                                                   arguments,
                                                   Array::ZoneHandle(),
-                                                  1);  // Checked arg count.
+                                                  2);  // Checked arg count.
   ReturnDefinition(call);
 }
 
@@ -1973,7 +1973,7 @@
                            Token::kSET,
                            arguments,
                            Array::ZoneHandle(),
-                           1));  // Checked argument count.
+                           2));  // Checked argument count.
   ReturnDefinition(BuildLoadExprTemp());
 }