Split up HLoadNamedField and HStoreNamedField.

src/hydrogen-check-elimination.cc

Index: src/hydrogen-check-elimination.cc
diff --git a/src/hydrogen-check-elimination.cc b/src/hydrogen-check-elimination.cc
index bbd3042fb7af6659f4107fffb7127e1298000593..1af96b8c2d50782ee21cc90005dd6bb2f4f30154 100644
--- a/src/hydrogen-check-elimination.cc
+++ b/src/hydrogen-check-elimination.cc
@@ -268,11 +268,7 @@ class HCheckTable : public ZoneObject {
 
   void ReduceStoreNamedField(HStoreNamedField* instr) {
     HValue* object = instr->object()->ActualValue();
-    if (instr->has_transition()) {
-      // This store transitions the object to a new map.
-      Kill(object);
-      Insert(object, MapConstant(instr->transition()));
-    } else if (IsMapAccess(instr->access())) {
+    if (IsMapAccess(instr->access())) {
       // This is a store directly to the map field of the object.
       Kill(object);
       if (!instr->value()->IsConstant()) return;
@@ -474,7 +470,7 @@ class HCheckMapsEffects : public ZoneObject {
     // Kill maps for each store contained in these effects.
     for (int i = 0; i < stores_.length(); i++) {
       HStoreNamedField* s = stores_[i];
-      if (table->IsMapAccess(s->access()) || s->has_transition()) {
+      if (table->IsMapAccess(s->access())) {
         table->Kill(s->object()->ActualValue());
       }
     }