Remove FLAG_min_preparse_length.

test/test262/test262.status

Index: test/test262/test262.status
diff --git a/test/test262/test262.status b/test/test262/test262.status
index caf9b76d0073938d0534d9471769054f6b442e16..4548858438f6cb3dd254ee17489f784df98e9f0d 100644
--- a/test/test262/test262.status
+++ b/test/test262/test262.status
@@ -447,7 +447,16 @@
   # 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