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

runtime/vm/flow_graph_compiler.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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 422 matching lines @@
 
 void FlowGraphCompiler::EmitTestAndCall(const ICData& ic_data,
                                         Register class_id_reg,
                                         intptr_t arg_count,
                                         const Array& arg_names,
                                         Label* deopt,
                                         Label* done,
                                         intptr_t cid,
                                         intptr_t token_index,
                                         intptr_t try_index) {
+  ASSERT(!ic_data.IsNull() && (ic_data.NumberOfChecks() > 0));
   Label match_found;
   for (intptr_t i = 0; i < ic_data.NumberOfChecks(); i++) {
     const bool is_last_check = (i == (ic_data.NumberOfChecks() - 1));
     Label next_test;
     assembler()->cmpl(class_id_reg, Immediate(ic_data.GetReceiverClassIdAt(i)));
     if (is_last_check) {
       assembler()->j(NOT_EQUAL, deopt);
     } else {
       assembler()->j(NOT_EQUAL, &next_test);
     }
@@ skipping 339 matching lines @@
       return;
     }
   }
 
   // This move is not blocked.
   EmitMove(index);
 }
 
 
 }  // namespace dart