Heuristic for eager parsing works for async functions

test/test262/test262.status

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
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@@ skipping 392 matching lines @@
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=5546
   'language/expressions/tagged-template/invalid-escape-sequences': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=5537
   'built-ins/global/*': [SKIP],
 
   # PreParser doesn't produce early errors
   # https://bugs.chromium.org/p/v8/issues/detail?id=2728
   'language/expressions/async-arrow-function/early-errors-arrow-formals-body-duplicate': [FAIL],
-  'language/expressions/async-function/early-errors-expression-formals-body-duplicate': [FAIL],
   'language/expressions/object/method-definition/generator-param-redecl-const': [FAIL],
   'language/expressions/object/method-definition/generator-param-redecl-let': [FAIL],
   'language/expressions/object/method-definition/name-param-redecl': [FAIL],
   'language/statements/async-function/early-errors-declaration-formals-body-duplicate': [FAIL],
 
   # Module-related tests
   # v8:5485
   'language/module-code/comment-multi-line-html*': [FAIL],
   'language/module-code/comment-single-line-html*': [FAIL],
   # v8:5487
@@ skipping 194 matching lines @@
 
 ['variant == asm_wasm', {
   '*': [SKIP],
 }],  # variant == asm_wasm
 
 ['variant == wasm_traps', {
   '*': [SKIP],
 }],  # variant == wasm_traps
 
 ]