[generators] Implement Generator.prototype.return.

test/test262/test262.status

 # Copyright 2011 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
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 #       copyright notice, this list of conditions and the following
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@@ skipping 131 matching lines @@
   'built-ins/Array/prototype/Symbol.iterator': [FAIL],
   'built-ins/Array/prototype/values/returns-iterator': [FAIL],
   'built-ins/Array/prototype/values/returns-iterator-from-object': [FAIL],
   'built-ins/Array/prototype/values/prop-desc': [FAIL],
   'built-ins/Array/prototype/values/name': [FAIL],
   'built-ins/Array/prototype/values/length': [FAIL],
   'built-ins/Array/prototype/values/iteration': [FAIL],
   'built-ins/Array/prototype/values/iteration-mutable': [FAIL],
   'built-ins/Array/prototype/Symbol.unscopables/value': [FAIL],
 
-  # https://code.google.com/p/v8/issues/detail?id=3566
-  'built-ins/GeneratorPrototype/return/*': [SKIP],
-
   # https://code.google.com/p/v8/issues/detail?id=4248
   'language/expressions/compound-assignment/S11.13.2_A5.*': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A6.*': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A7.10_T4': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A7.11_T4': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A7.1_T4': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A7.2_T4': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A7.3_T4': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A7.4_T4': [FAIL],
   'language/expressions/compound-assignment/S11.13.2_A7.5_T4': [FAIL],
@@ skipping 515 matching lines @@
   'built-ins/decodeURIComponent/S15.1.3.2_A1.12_T2': [SKIP],
   'built-ins/decodeURIComponent/S15.1.3.2_A1.12_T3': [SKIP],
   'intl402/9.2.2': [SKIP],
   'language/statements/let/fn-name-arrow': [SKIP],
   'language/statements/let/fn-name-cover': [SKIP],
   'language/statements/let/fn-name-fn': [SKIP],
   'language/statements/let/fn-name-gen': [SKIP],
 }],  # ignition == True and (arch == arm or arch == arm64)
 
 ]