Using GetMoreGeneralElementsKind in more places

src/elements.cc

Index: src/elements.cc
diff --git a/src/elements.cc b/src/elements.cc
index 32e6605ca2fbd04d07a80a387a825c6bec346482..3b3cda0abfe666d6e652fb41049b29c22fe3b382 100644
--- a/src/elements.cc
+++ b/src/elements.cc
@@ -2375,9 +2375,7 @@ Handle<JSArray> ElementsAccessor::Concat(Isolate* isolate, Arguments* args,
       ElementsKind arg_kind = JSArray::cast(arg)->map()->elements_kind();
       has_double = has_double || IsFastDoubleElementsKind(arg_kind);
       is_holey = is_holey || IsFastHoleyElementsKind(arg_kind);
-      if (IsMoreGeneralElementsKindTransition(elements_kind, arg_kind)) {
-        elements_kind = arg_kind;
-      }
+      elements_kind = GetMoreGeneralElementsKind(elements_kind, arg_kind);
     }
     if (is_holey) {
       elements_kind = GetHoleyElementsKind(elements_kind);