Fix constructors for HLoadNamedField.

src/hydrogen-load-elimination.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "hydrogen-alias-analysis.h"
 #include "hydrogen-load-elimination.h"
 #include "hydrogen-instructions.h"
 #include "hydrogen-flow-engine.h"
 
 namespace v8 {
@@ skipping 35 matching lines @@
   // The main processing of instructions.
   HLoadEliminationTable* Process(HInstruction* instr, Zone* zone) {
     switch (instr->opcode()) {
       case HValue::kLoadNamedField: {
         HLoadNamedField* l = HLoadNamedField::cast(instr);
         TRACE((" process L%d field %d (o%d)\n",
                instr->id(),
                FieldOf(l->access()),
                l->object()->ActualValue()->id()));
         HValue* result = load(l);
-        if (result != instr &&
-            result->type().Equals(instr->type()) &&
-            result->representation().Equals(instr->representation()) &&
-            (!result->IsLoadNamedField() ||
-             HLoadNamedField::cast(instr)->maps()->IsSubset(
-                 HLoadNamedField::cast(result)->maps()))) {
+        if (result != instr && l->CanBeReplacedWith(result)) {
           // The load can be replaced with a previous load or a value.
           TRACE(("  replace L%d -> v%d\n", instr->id(), result->id()));
           instr->DeleteAndReplaceWith(result);
         }
         break;
       }
       case HValue::kStoreNamedField: {
         HStoreNamedField* s = HStoreNamedField::cast(instr);
         TRACE((" process S%d field %d (o%d) = v%d\n",
                instr->id(),
@@ skipping 436 matching lines @@
   } else {
     // Perform only local analysis.
     for (int i = 0; i < graph()->blocks()->length(); i++) {
       table->Kill();
       engine.AnalyzeOneBlock(graph()->blocks()->at(i), table);
     }
   }
 }
 
 } }  // namespace v8::internal