Remove unnecessary AST node for ++ and -- operations.

src/rewriter.cc

 // Copyright 2010 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 414 matching lines @@
       default:
         UNREACHABLE();
         break;
     }
   } else if (node->op() == Token::BIT_NOT) {
     node->expression()->set_to_int32(true);
   }
 }
 
 
-void AstOptimizer::VisitIncrementOperation(IncrementOperation* node) {
-  UNREACHABLE();
-}
-
-
 void AstOptimizer::VisitCountOperation(CountOperation* node) {
   // Count operations assume that they work on Smis.
   node->expression()->set_no_negative_zero(node->is_prefix() ?
                                            true :
                                            node->no_negative_zero());
   node->type()->SetAsLikelySmiIfUnknown();
   node->expression()->type()->SetAsLikelySmiIfUnknown();
   Visit(node->expression());
 }
 
@@ skipping 486 matching lines @@
   UNREACHABLE();
 }
 
 
 void Processor::VisitUnaryOperation(UnaryOperation* node) {
   USE(node);
   UNREACHABLE();
 }
 
 
-void Processor::VisitIncrementOperation(IncrementOperation* node) {
-  UNREACHABLE();
-}
-
-
 void Processor::VisitCountOperation(CountOperation* node) {
   USE(node);
   UNREACHABLE();
 }
 
 
 void Processor::VisitBinaryOperation(BinaryOperation* node) {
   USE(node);
   UNREACHABLE();
 }
@@ skipping 54 matching lines @@
   if (FLAG_optimize_ast && !body->is_empty()) {
     AstOptimizer optimizer;
     optimizer.Optimize(body);
     if (optimizer.HasStackOverflow()) return false;
   }
   return true;
 }
 
 
 } }  // namespace v8::internal