Revert of ES6 computed property names

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 7b9a6c31e3c80c5de9a6b4e3c8367abe3882a85d..c0b3d395bb345f5542be53db9db43ed76e47a87a 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -5633,12 +5633,9 @@
 
   for (int i = 0; i < expr->properties()->length(); i++) {
     ObjectLiteral::Property* property = expr->properties()->at(i);
-    if (property->is_computed_name()) {
-      return Bailout(kComputedPropertyName);
-    }
     if (property->IsCompileTimeValue()) continue;
 
-    Literal* key = property->key()->AsLiteral();
+    Literal* key = property->key();
     Expression* value = property->value();
 
     switch (property->kind()) {
@@ -5664,7 +5661,7 @@
             }
 
             Handle<Map> map = property->GetReceiverType();
-            Handle<String> name = key->AsPropertyName();
+            Handle<String> name = property->key()->AsPropertyName();
             HInstruction* store;
             if (map.is_null()) {
               // If we don't know the monomorphic type, do a generic store.