Remove redundant Scope book-keeping

test/cctest/test-parsing.cc

 // Copyright 2012 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 1086 matching lines @@
 
       i::Scope* scope = script_scope->inner_scope();
       DCHECK_NOT_NULL(scope);
       DCHECK_NULL(scope->sibling());
       // Adjust for constructor scope.
       if (j == 2) {
         scope = scope->inner_scope();
         DCHECK_NOT_NULL(scope);
         DCHECK_NULL(scope->sibling());
       }
-      CHECK_EQ((source_data[i].expected & ARGUMENTS) != 0,
-               scope->uses_arguments());
+      // Arrows themselves never get an arguments object.
+      if ((source_data[i].expected & ARGUMENTS) != 0 &&
+          !scope->is_arrow_scope()) {
+        CHECK_NOT_NULL(scope->arguments());
+      }
       CHECK_EQ((source_data[i].expected & SUPER_PROPERTY) != 0,
                scope->uses_super_property());
       if ((source_data[i].expected & THIS) != 0) {
         // Currently the is_used() flag is conservative; all variables in a
         // script scope are marked as used.
         CHECK(
             scope->Lookup(info.ast_value_factory()->this_string())->is_used());
       }
       CHECK_EQ((source_data[i].expected & EVAL) != 0, scope->calls_eval());
     }
@@ skipping 6836 matching lines @@
     "(a,);",
     "(a,b,c,);",
     NULL
   };
   // clang-format on
 
   static const ParserFlag always_flags[] = {kAllowHarmonyTrailingCommas};
   RunParserSyncTest(context_data, data, kError, NULL, 0, always_flags,
                     arraysize(always_flags));
 }