ES6: Desugaring of instanceof to support @@hasInstance

test/test262/test262.status

Index: test/test262/test262.status
diff --git a/test/test262/test262.status b/test/test262/test262.status
index 08542ca17d462f9c9088d43d5b9865396b8f1776..26935e57c9ef27e03a39c4a5e535f6c80376538a 100644
--- a/test/test262/test262.status
+++ b/test/test262/test262.status
@@ -193,12 +193,10 @@
   'intl402/Collator/10.1.1_a': [FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=4447
-  'language/expressions/instanceof/prototype-getter-with-object-throws': [FAIL],
-  'language/expressions/instanceof/prototype-getter-with-object': [FAIL],
-  'language/expressions/instanceof/primitive-prototype-with-object': [FAIL],
-  'language/expressions/instanceof/symbol-hasinstance-get-err': [FAIL],
-  'language/expressions/instanceof/symbol-hasinstance-invocation': [FAIL],
-  'language/expressions/instanceof/symbol-hasinstance-to-boolean': [FAIL],
+  # TODO(mvstanton): these tests don't exist anymore, why?
+  # 'language/expressions/instanceof/prototype-getter-with-object-throws': [FAIL],
+  # 'language/expressions/instanceof/prototype-getter-with-object': [FAIL],
+  # 'language/expressions/instanceof/primitive-prototype-with-object': [FAIL],
 
   # https://code.google.com/p/v8/issues/detail?id=4476
   'built-ins/String/prototype/toLocaleLowerCase/special_casing_conditional': [FAIL],