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

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 12253)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -2157,8 +2157,11 @@
 
 class StoreInstanceFieldInstr : public TemplateDefinition<2> {
  public:
-  StoreInstanceFieldInstr(const Field& field, Value* instance, Value* value)
-      : field_(field) {
+  StoreInstanceFieldInstr(const Field& field,
+                          Value* instance,
+                          Value* value,
+                          bool emit_store_barrier)
+      : field_(field), emit_store_barrier_(emit_store_barrier) {
     ASSERT(instance != NULL);
     ASSERT(value != NULL);
     inputs_[0] = instance;
@@ -2172,6 +2175,9 @@
 
   Value* instance() const { return inputs_[0]; }
   Value* value() const { return inputs_[1]; }
+  bool emit_store_barrier() const {
+    return emit_store_barrier_;
+  }
 
   virtual void PrintOperandsTo(BufferFormatter* f) const;
 
@@ -2180,6 +2186,7 @@
 
  private:
   const Field& field_;
+  const bool emit_store_barrier_;
 
   DISALLOW_COPY_AND_ASSIGN(StoreInstanceFieldInstr);
 };