Remove FLAG_min_preparse_length.

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
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 429 matching lines @@
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=5336
   'language/expressions/super/call-proto-not-ctor': [FAIL],
 
   # 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],
 
-  ######################## NEEDS INVESTIGATION ###########################
+  # 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],
+
+######################## NEEDS INVESTIGATION ###########################
 
   # These test failures are specific to the intl402 suite and need investigation
   # to be either marked as bugs with issues filed for them or as deliberate
   # incompatibilities if the test cases turn out to be broken or ambiguous.
   # Some of these are related to v8:4361 in being visible side effects from Intl.
   'intl402/6.2.3': [FAIL],
   'intl402/Collator/10.1.2.1_4': [FAIL],
   'intl402/Collator/10.1.2_a': [PASS, FAIL],
   'intl402/Collator/10.2.3_b': [PASS, FAIL],
   'intl402/Collator/prototype/10.3_a': [FAIL],
@@ skipping 158 matching lines @@
 
   # v8:5487
   'language/module-code/namespace/internals/get-own-property-str-found-uninit': [FAIL],
 
   # v8:5401
   'language/module-code/namespace/internals/set': [FAIL],
   'language/module-code/namespace/internals/define-own-property': [FAIL],
 }],  # variant == ignition or variant == ignition_staging or variant == ignition_turbofan
 
 ]