Fix StoreIsUninitialized, and add Soft Deopt if keyed store is uninitialized.

src/hydrogen.cc

 // 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 5978 matching lines @@
       instr = BuildMonomorphicElementAccess(
           obj, key, val, NULL, map, is_store, expr->GetStoreMode());
     }
   } else if (expr->GetReceiverTypes() != NULL &&
              !expr->GetReceiverTypes()->is_empty()) {
     return HandlePolymorphicElementAccess(
         obj, key, val, expr, ast_id, position, is_store,
         expr->GetStoreMode(), has_side_effects);
   } else {
     if (is_store) {
+      if (expr->IsAssignment() && expr->AsAssignment()->IsUninitialized()) {
+        AddSoftDeoptimize();
+      }
       instr = BuildStoreKeyedGeneric(obj, key, val);
     } else {
+      if (expr->AsProperty()->IsUninitialized()) {
+        AddSoftDeoptimize();
+      }
       instr = BuildLoadKeyedGeneric(obj, key);
     }
     AddInstruction(instr);
   }
   if (position != RelocInfo::kNoPosition) instr->set_position(position);
   *has_side_effects = instr->HasObservableSideEffects();
   return instr;
 }
 
 
@@ skipping 4103 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal