Do not emit Simulates in HandlePolymorphicElementAccess.

src/hydrogen.cc

 // Copyright 2012 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 7671 matching lines @@
                                             HType::Smi()));
         checked_key = AddBoundsCheck(key, length, ALLOW_SMI_KEY);
         access = AddInstruction(BuildFastElementAccess(
             elements, checked_key, val, elements_kind_branch,
             elements_kind, is_store, STANDARD_STORE));
         if (!is_store) {
           Push(access);
         }
 
         *has_side_effects |= access->HasObservableSideEffects();
+        // The caller will use has_side_effects and add correct Simulate.
+        access->SetFlag(HValue::kHasNoObservableSideEffects);
         if (position != -1) {
           access->set_position(position);
         }
-        if_jsarray->Goto(join);
+        if_jsarray->GotoNoSimulate(join);
 
         set_current_block(if_fastobject);
         length = AddInstruction(new(zone()) HFixedArrayBaseLength(elements));
         checked_key = AddBoundsCheck(key, length, ALLOW_SMI_KEY);
         access = AddInstruction(BuildFastElementAccess(
             elements, checked_key, val, elements_kind_branch,
             elements_kind, is_store, STANDARD_STORE));
       } else if (elements_kind == DICTIONARY_ELEMENTS) {
         if (is_store) {
           access = AddInstruction(BuildStoreKeyedGeneric(object, key, val));
         } else {
           access = AddInstruction(BuildLoadKeyedGeneric(object, key));
         }
       } else {  // External array elements.
         access = AddInstruction(BuildExternalArrayElementAccess(
             external_elements, checked_key, val,
             elements_kind_branch, elements_kind, is_store));
       }
       *has_side_effects |= access->HasObservableSideEffects();
+      // The caller will use has_side_effects and add correct Simulate.
+      access->SetFlag(HValue::kHasNoObservableSideEffects);
       if (position != RelocInfo::kNoPosition) access->set_position(position);
       if (!is_store) {
         Push(access);
       }
-      current_block()->Goto(join);
+      current_block()->GotoNoSimulate(join);
       set_current_block(if_false);
     }
   }
 
   // Deopt if none of the cases matched.
   current_block()->FinishExitWithDeoptimization(HDeoptimize::kNoUses);
-  join->SetJoinId(ast_id);
   set_current_block(join);
   return is_store ? NULL : Pop();
 }
 
 
 HValue* HOptimizedGraphBuilder::HandleKeyedElementAccess(
     HValue* obj,
     HValue* key,
     HValue* val,
     Expression* expr,
@@ skipping 4072 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal