Fix constructors for HLoadNamedField.

src/hydrogen-load-elimination.cc

Index: src/hydrogen-load-elimination.cc
diff --git a/src/hydrogen-load-elimination.cc b/src/hydrogen-load-elimination.cc
index 836bd2d3560676739cebc4669031e30153f8ef26..1198d2b7ab59afeb6318745c0cf45fcf440138bf 100644
--- a/src/hydrogen-load-elimination.cc
+++ b/src/hydrogen-load-elimination.cc
@@ -53,12 +53,7 @@ class HLoadEliminationTable : public ZoneObject {
                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);