[promise] Test IsPromise() early in Promise.prototype.then()

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
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 #
 #     * 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 397 matching lines @@
   'language/expressions/object/method-definition/generator-invoke-ctor': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=4632
   'built-ins/Promise/race/same-resolve-function': [FAIL],
   'built-ins/Promise/race/same-reject-function': [FAIL],
   'built-ins/Promise/all/same-resolve-function': [FAIL],
   'built-ins/Promise/all/same-reject-function': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=4633
   'built-ins/Promise/prototype/then/deferred-is-resolved-value': [SKIP],
-  'built-ins/Promise/prototype/then/context-check-on-entry': [FAIL],
   'built-ins/Promise/exception-after-resolve-in-executor': [FAIL],
   'built-ins/Promise/reject-function-name': [FAIL],
   'built-ins/Promise/reject-function-nonconstructor': [FAIL],
   'built-ins/Promise/resolve-function-name': [FAIL],
   'built-ins/Promise/resolve-function-nonconstructor': [FAIL],
   'built-ins/Promise/all/call-resolve-element-after-return': [FAIL],
   'built-ins/Promise/all/call-resolve-element': [FAIL],
   'built-ins/Promise/all/call-resolve-element-items': [FAIL],
   'built-ins/Promise/all/resolve-before-loop-exit-from-same': [FAIL],
   'built-ins/Promise/all/resolve-element-function-name': [FAIL],
@@ skipping 320 matching lines @@
   'built-ins/decodeURIComponent/S15.1.3.2_A1.13_T2': [SKIP],
   'built-ins/decodeURIComponent/S15.1.3.2_A1.14_T1': [SKIP],
   'built-ins/decodeURIComponent/S15.1.3.2_A1.14_T2': [SKIP],
   'built-ins/decodeURIComponent/S15.1.3.2_A1.2_T1': [SKIP],
   'built-ins/decodeURIComponent/S15.1.3.2_A1.2_T2': [SKIP],
   'built-ins/encodeURI*': [SKIP],
   'intl402/9.2.2': [SKIP],
 }],  # ignition == True and (arch == arm or arch == arm64)
 
 ]