[compiler] Allow optimization of functions with rest parameters.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 8155dcc42889c1973ae76d7466f66ba3ebcf6c1d..8e617b07a23e3e938c4940c832e76c6bbf5db313 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -4400,10 +4400,6 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
   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;
 }