Revert of Use weak cells in map checks in polymorphic ICs.

test/mjsunit/opt-elements-kind.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 124 matching lines @@
   convert_mixed(construct_smis(), "three", elements_kind.fast);
   convert_mixed(construct_doubles(), "three", elements_kind.fast);
 
   smis = construct_smis();
   doubles = construct_doubles();
   convert_mixed(smis, 1, elements_kind.fast);
   convert_mixed(doubles, 1, elements_kind.fast);
   assertTrue(%HaveSameMap(smis, doubles));
 }
 
-function clear_ic_state() {
-  %ClearFunctionTypeFeedback(construct_smis);
-  %ClearFunctionTypeFeedback(construct_doubles);
-  %ClearFunctionTypeFeedback(convert_mixed);
-}
-
 test1();
-clear_ic_state();
+gc(); // clear IC state
 test1();
-clear_ic_state();
+gc(); // clear IC state
 %OptimizeFunctionOnNextCall(test1);
 test1();
-clear_ic_state();
+gc(); // clear IC state