[compiler] Allow optimization of functions with rest parameters.

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 4382 matching lines @@
                                : FunctionLiteral::kNoDuplicateParameters;
 
   FunctionLiteral* function_literal = factory()->NewFunctionLiteral(
       function_name, scope, body, materialized_literal_count,
       expected_property_count, arity, duplicate_parameters, function_type,
       eager_compile_hint, kind, pos);
   function_literal->set_function_token_position(function_token_pos);
   if (should_be_used_once_hint)
     function_literal->set_should_be_used_once_hint();
 
-  if (scope->has_rest_parameter()) {
-    function_literal->set_dont_optimize_reason(kRestParameter);
-  }
-
   if (fni_ != NULL && should_infer_name) fni_->AddFunction(function_literal);
   return function_literal;
 }
 
 
 void Parser::SkipLazyFunctionBody(int* materialized_literal_count,
                                   int* expected_property_count, bool* ok,
                                   Scanner::BookmarkScope* bookmark) {
   DCHECK_IMPLIES(bookmark, bookmark->HasBeenSet());
   if (produce_cached_parse_data()) CHECK(log_);
@@ skipping 1362 matching lines @@
     function->set_raw_name(name);
   } else {
     DCHECK(value->IsClassLiteral());
     value->AsClassLiteral()->constructor()->set_raw_name(name);
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8