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

runtime/vm/flow_graph_optimizer.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/flow_graph_builder.h"
 #include "vm/il_printer.h"
 #include "vm/object_store.h"
 
@@ skipping 362 matching lines @@
       return;
     }
     const intptr_t kMaxChecks = 4;
     if (comp->ic_data()->NumberOfChecks() <= kMaxChecks) {
       PolymorphicInstanceCallComp* call = new PolymorphicInstanceCallComp(comp);
       ICData& unary_checks =
           ICData::ZoneHandle(comp->ic_data()->AsUnaryClassChecks());
       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.
 }
 
 
 void FlowGraphOptimizer::VisitStaticCall(StaticCallComp* comp,
                                          BindInstr* instr) {
   MethodRecognizer::Kind recognized_kind =
       MethodRecognizer::RecognizeKind(comp->function());
   if (recognized_kind == MethodRecognizer::kMathSqrt) {
     comp->set_recognized(MethodRecognizer::kMathSqrt);
   }
@@ skipping 198 matching lines @@
       LocationSummary* locs = it.Current()->locs();
       if ((locs != NULL) && locs->is_call()) {
         is_leaf_ = false;
         return;
       }
     }
   }
 }
 
 }  // namespace dart