Fix problem of excessive attempts to optimize, fix excessive deoptimizations for load/store indexed…

runtime/vm/flow_graph_optimizer.cc

Index: runtime/vm/flow_graph_optimizer.cc
===================================================================
--- runtime/vm/flow_graph_optimizer.cc	(revision 9644)
+++ runtime/vm/flow_graph_optimizer.cc	(working copy)
@@ -380,12 +380,9 @@
       call->set_ic_data(&unary_checks);
       instr->set_computation(call);
     }
-  } else {
-    // Mark it for deopt.
-    PolymorphicInstanceCallComp* call = new PolymorphicInstanceCallComp(comp);
-    call->set_ic_data(&ICData::ZoneHandle());
-    instr->set_computation(call);
   }
+  // An instance call without ICData should continue calling via IC calls
+  // which should trigger reoptimization of optimized code.
 }