Fix deoptimization problem with inlined Array.push()

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 7793 matching lines @@
       // chain, which would cause elements to go to dictionary mode and result
       // in a map change.
       Handle<JSObject> prototype(JSObject::cast(receiver_map->prototype()));
       BuildCheckPrototypeMaps(prototype, Handle<JSObject>());
 
       const int argc = expr->arguments()->length();
       if (argc != 1) return false;
 
       HValue* value_to_push = Pop();
       HValue* array = Pop();
+      Drop(1);  // Drop function.
 
       HInstruction* new_size = NULL;
       HValue* length = NULL;
 
       {
         NoObservableSideEffectsScope scope(this);
 
         length = Add<HLoadNamedField>(array, static_cast<HValue*>(NULL),
           HObjectAccess::ForArrayLength(elements_kind));
 
         new_size = AddUncasted<HAdd>(length, graph()->GetConstant1());
 
         bool is_array = receiver_map->instance_type() == JS_ARRAY_TYPE;
         BuildUncheckedMonomorphicElementAccess(array, length,
                                                value_to_push, is_array,
                                                elements_kind, STORE,
                                                NEVER_RETURN_HOLE,
                                                STORE_AND_GROW_NO_TRANSITION);
         Add<HSimulate>(expr->id(), REMOVABLE_SIMULATE);
       }
 
-      Drop(1);  // Drop function.
       ast_context()->ReturnValue(new_size);
       return true;
     }
     default:
       // Not yet supported for inlining.
       break;
   }
   return false;
 }
 
@@ skipping 3826 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal