Use explicit push-argument for InstanceSetter instruction.

vm/il_printer.cc

Index: vm/il_printer.cc
===================================================================
--- vm/il_printer.cc	(revision 10115)
+++ vm/il_printer.cc	(working copy)
@@ -176,6 +176,16 @@
   }
 }
 
+
+void InstanceSetterComp::PrintOperandsTo(BufferFormatter* f) const {
+  f->Print("%s", field_name().ToCString());
+  for (intptr_t i = 0; i < ArgumentCount(); ++i) {
+    f->Print(", ");
+    f->Print("cid%d", ArgumentAt(i)->cid());
+  }
+}
+
+
 void StrictCompareComp::PrintOperandsTo(BufferFormatter* f) const {
   f->Print("%s, ", Token::Str(kind()));
   left()->PrintTo(f);