Fix polymorphic hydrogen handling of SLOPPY_ARGUMENTS_ELEMENTS

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 282fae7800bab93132c198f0c338762c2cce7b74..891c714e769181f94b4f13a9c8e71f2908f4a4f4 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -6395,6 +6395,11 @@ HValue* HOptimizedGraphBuilder::HandlePolymorphicElementAccess(
         elements_kind != GetInitialFastElementsKind()) {
       possible_transitioned_maps.Add(map);
     }
+    if (elements_kind == SLOPPY_ARGUMENTS_ELEMENTS) {
+      HInstruction* result = BuildKeyedGeneric(access_type, object, key, val);
+      *has_side_effects = result->HasObservableSideEffects();
+      return AddInstruction(result);
+    }
   }
   // Get transition target for each map (NULL == no transition).
   for (int i = 0; i < maps->length(); ++i) {