ES6: Desugaring of instanceof to support @@hasInstance

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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@@ skipping 850 matching lines @@
   'regress/regress-4266': [FAIL],
   'harmony/simd': [FAIL],
   'regress/regress-crbug-109362': [FAIL],
   'regress/regress-131994': [FAIL],
   'regress/regress-crbug-568477-2': [FAIL],
   'regress/regress-crbug-568477-3': [FAIL],
   'regress/regress-crbug-568477-1': [FAIL],
   'regress/regress-2318': [FAIL],
   'regress/regress-crbug-582051': [FAIL],
 
+  # TODO(rmcilroy, 4680): new ES6 instanceof support
+  'harmony/instanceof-es6': [SKIP],
+
   # TODO(rmcilroy,4680): Test timeouts.
   'array-literal-transitions': [SKIP],
   'regress/regress-crbug-517592': [SKIP],
   'regress/regress-crbug-568477-4': [SKIP],
   'regress/regress-crbug-409614': [SKIP],
   'regress/regress-crbug-42414': [SKIP],
   'regress/regress-1853': [SKIP],
   'regress/regress-crbug-424142': [SKIP],
 }],  # ignition == True
 
@@ skipping 36 matching lines @@
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
   'strong/implicit-conversions': [SKIP],
   'strong/load-element-mutate-backing-store': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]