Avoid converting key to string for deleting of elements

test/test262/test262.status

Index: test/test262/test262.status
diff --git a/test/test262/test262.status b/test/test262/test262.status
index 72685ff5c1af5365a0bb5b8e896b3c7d4585ee93..feed1a320662db1dbb64d932d85a9ac820df3fb8 100644
--- a/test/test262/test262.status
+++ b/test/test262/test262.status
@@ -36,6 +36,30 @@
   '11.2.3_b': [FAIL],
   '12.2.3_b': [FAIL],
 
+  # BUG(v8:4267)
+  '15.2.3.6-4-116': [FAIL],
+  '15.2.3.6-4-117': [FAIL],
+  '15.2.3.6-4-168': [FAIL],
+  '15.2.3.6-4-169': [FAIL],
+  '15.2.3.6-4-170': [FAIL],
+  '15.2.3.6-4-172': [FAIL],
+  '15.2.3.6-4-173': [FAIL],
+  '15.2.3.6-4-174': [FAIL],
+  '15.2.3.6-4-176': [FAIL],
+  '15.2.3.6-4-177': [FAIL],
+  '15.2.3.7-6-a-112': [FAIL],
+  '15.2.3.7-6-a-113': [FAIL],
+  '15.2.3.7-6-a-164': [FAIL],
+  '15.2.3.7-6-a-165': [FAIL],
+  '15.2.3.7-6-a-166': [FAIL],
+  '15.2.3.7-6-a-168': [FAIL],
+  '15.2.3.7-6-a-169': [FAIL],
+  '15.2.3.7-6-a-170': [FAIL],
+  '15.2.3.7-6-a-172': [FAIL],
+  '15.2.3.7-6-a-173': [FAIL],
+  '15.2.3.7-6-a-175': [FAIL],
+  '15.2.3.7-6-a-176': [FAIL],
+
   ############################### ES6 ###################################
   # ES6 allows block-local functions.
   'Sbp_A1_T1': [PASS, FAIL_OK],