Fix TransitionElementsKindStub to handle non-JSArray objects correctly.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 36e876dc22c19841d27f87bdadb9adf8df6c2f14..7d62d5c76e535117f32c1a9627b2b9f68d03a318 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4726,7 +4726,8 @@ void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
       __ mov(eax, object_reg);
     }
     __ mov(ebx, to_map);
-    TransitionElementsKindStub stub(from_kind, to_kind);
+    bool is_js_array = from_map->instance_type() == JS_ARRAY_TYPE;
+    TransitionElementsKindStub stub(from_kind, to_kind, is_js_array);
     __ CallStub(&stub);
     RecordSafepointWithRegisters(
         instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);