Allow miss in GENERIC keyed load/store.

Review URL: https://chromiumcodereview.appspot.com/11975044

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13408 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ic.cc

@@ -1343,10 +1343,10 @@ void KeyedLoadIC::UpdateCaches(LookupResult* lookup,
       }
       break;
     case MEGAMORPHIC:
+    case GENERIC:
     case DEBUG_STUB:
       break;
     case MONOMORPHIC_PROTOTYPE_FAILURE:
-    case GENERIC:
       UNREACHABLE();
       break;
   }
@@ -2124,10 +2124,10 @@ void KeyedStoreIC::UpdateCaches(LookupResult* lookup,
       }
       break;
     case MEGAMORPHIC:
+    case GENERIC:
     case DEBUG_STUB:
       break;
     case MONOMORPHIC_PROTOTYPE_FAILURE:
-    case GENERIC:
       UNREACHABLE();
       break;
   }