[ast cleanup] Remove unnecessary frozen_ bit from ModuleDescriptor

src/parsing/parser.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/parsing/parser.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-rewriter.h"
 #include "src/ast/ast-expression-visitor.h"
@@ skipping 1329 matching lines @@
       // TODO(adamk): Pass both local_name and export_name once ParserTraits
       // supports multiple arg error messages.
       // Also try to report this at a better location.
       ParserTraits::ReportMessage(MessageTemplate::kModuleExportUndefined,
                                   it.local_name());
       *ok = false;
       return NULL;
     }
   }
 
-  scope_->module()->Freeze();
   return NULL;
 }
 
 
 const AstRawString* Parser::ParseModuleSpecifier(bool* ok) {
   // ModuleSpecifier :
   //    StringLiteral
 
   Expect(Token::STRING, CHECK_OK);
   return GetSymbol(scanner());
@@ skipping 4376 matching lines @@
     auto class_literal = value->AsClassLiteral();
     if (class_literal->raw_name() == nullptr) {
       class_literal->set_raw_name(name);
     }
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8