Revert "Refactor transitioning stores."

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 6967630b57cd4e25c8ddf27ae65e483845821996..1198d2b7ab59afeb6318745c0cf45fcf440138bf 100644
--- a/src/hydrogen-load-elimination.cc
+++ b/src/hydrogen-load-elimination.cc
@@ -240,7 +240,12 @@ class HLoadEliminationTable : public ZoneObject {
     HValue* object = instr->object()->ActualValue();
     HValue* value = instr->value();
 
-    if (instr->store_mode() == STORE_TO_INITIALIZED_ENTRY) {
+    if (instr->has_transition()) {
+      // A transition introduces a new field and alters the map of the object.
+      // Since the field in the object is new, it cannot alias existing entries.
+      // TODO(titzer): introduce a constant for the new map and remember it.
+      KillFieldInternal(object, FieldOf(JSObject::kMapOffset), NULL);
+    } else {
       // Kill non-equivalent may-alias entries.
       KillFieldInternal(object, field, value);
     }