Unify kMaxArguments with number of bits used to encode it.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 17d5a461de2a4ee3f6c19d34342e84494cb44fce..cdc0adb561831ee012fdd3434d9c210828a67cca 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -4201,7 +4201,7 @@ ZoneList<Expression*>* Parser::ParseArguments(bool* ok) {
   while (!done) {
     Expression* argument = ParseAssignmentExpression(true, CHECK_OK);
     result->Add(argument, zone());
-    if (result->length() > kMaxNumFunctionParameters) {
+    if (result->length() > Code::kMaxArguments) {
       ReportMessageAt(scanner().location(), "too_many_arguments",
                       Vector<const char*>::empty());
       *ok = false;
@@ -4378,7 +4378,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> function_name,
 
       top_scope_->DeclareParameter(param_name, VAR);
       num_parameters++;
-      if (num_parameters > kMaxNumFunctionParameters) {
+      if (num_parameters > Code::kMaxArguments) {
         ReportMessageAt(scanner().location(), "too_many_parameters",
                         Vector<const char*>::empty());
         *ok = false;