Refactor class declaration logic to the parser and runtime

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 1459 matching lines @@
       CHECK_NOT_NULL(inner->body());
       CHECK_GE(2, inner->body()->length());
       i::Expression* exp = inner->body()->at(1)->AsExpressionStatement()->
                            expression()->AsBinaryOperation()->right();
       if (exp->IsFunctionLiteral()) {
         fun = exp->AsFunctionLiteral();
       } else if (exp->IsObjectLiteral()) {
         fun = exp->AsObjectLiteral()->properties()->at(0)->value()->
               AsFunctionLiteral();
       } else {
-        fun = exp->AsClassLiteral()->properties()->at(0)->value()->
-              AsFunctionLiteral();
+        fun = exp->AsDoExpression()->represented_function();
       }
     }
     CHECK_NULL(fun->body());
   }
 }
 
 
 const char* ReadString(unsigned* start) {
   int length = start[0];
   char* result = i::NewArray<char>(length + 1);
@@ skipping 6472 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));
 }