Revert of Add a separate scope for switch

src/scopes.h

 // 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.
 
 #ifndef V8_SCOPES_H_
 #define V8_SCOPES_H_
 
 #include "src/ast.h"
 #include "src/pending-compilation-error-handler.h"
 #include "src/zone.h"
@@ skipping 228 matching lines @@
   //   start position: start position of '('
   //   end position: end position of '}'
   // * For the scope of a catch block
   //     try { stms } catch(e) { stmts }
   //   start position: start position of '('
   //   end position: end position of ')'
   // * For the scope of a for-statement
   //     for (let x ...) stmt
   //   start position: start position of '('
   //   end position: end position of last token of 'stmt'
-  // * For the scope of a switch statement
-  //     switch (tag) { cases }
-  //   start position: start position of '{'
-  //   end position: end position of '}'
   int start_position() const { return start_position_; }
   void set_start_position(int statement_pos) {
     start_position_ = statement_pos;
   }
   int end_position() const { return end_position_; }
   void set_end_position(int statement_pos) {
     end_position_ = statement_pos;
   }
 
   // In some cases we want to force context allocation for a whole scope.
@@ skipping 503 matching lines @@
   PendingCompilationErrorHandler pending_error_handler_;
 
   // For tracking which classes are declared consecutively. Needed for strong
   // mode.
   int class_declaration_group_start_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_