Use Scope::function_kind_ to distinguish arrow function scopes

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 1193 matching lines @@
       "  more;", i::BLOCK_SCOPE, i::STRICT },
     { "  start;\n"
       "  function fun", "(a,b) { infunction; }", " more;",
       i::FUNCTION_SCOPE, i::SLOPPY },
     { "  start;\n"
       "  function fun", "(a,b) {\n"
       "    infunction;\n"
       "  }", "\n"
       "  more;", i::FUNCTION_SCOPE, i::SLOPPY },
     { "  start;\n", "(a,b) => a + b", "; more;",
-      i::ARROW_SCOPE, i::SLOPPY },
+      i::FUNCTION_SCOPE, i::SLOPPY },
     { "  start;\n", "(a,b) => { return a+b; }", "\nmore;",
-      i::ARROW_SCOPE, i::SLOPPY },
+      i::FUNCTION_SCOPE, i::SLOPPY },
     { "  start;\n"
       "  (function fun", "(a,b) { infunction; }", ")();",
       i::FUNCTION_SCOPE, i::SLOPPY },
     { "  for ", "(let x = 1 ; x < 10; ++ x) { block; }", " more;",
       i::BLOCK_SCOPE, i::STRICT },
     { "  for ", "(let x = 1 ; x < 10; ++ x) { block; }", "; more;",
       i::BLOCK_SCOPE, i::STRICT },
     { "  for ", "(let x = 1 ; x < 10; ++ x) {\n"
       "    block;\n"
       "  }", "\n"
@@ skipping 5992 matching lines @@
     NULL
   };
   // clang-format on
 
   static const ParserFlag fail_flags[] = {
       kAllowHarmonySloppy, kAllowHarmonySloppyLet, kNoLegacyConst,
       kAllowHarmonyDestructuring};
   RunParserSyncTest(context_data, fail_data, kError, NULL, 0, fail_flags,
                     arraysize(fail_flags));
 }