Allow miss in GENERIC keyed load/store.

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 7963b26f1ec03d7b5c65d4e3605e68053606d4c9..0a99772585691b2da9dbc629e4dbd863bb620677 100644
--- a/src/ic.cc
+++ b/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;
   }