dont use exec_with_allocation for old ruby versions

Author: viuginick1

lib/ruby-debug-ide/xml_printer.rb

@@ -168,6 +168,8 @@ def print_string(string)
     end
 
     def exec_with_allocation_control(value, memory_limit, time_limit, exec_method, overflow_message_type)
+      return value.send exec_method if(RUBY_VERSION < '2.0')
+
       check_memory_limit = true
       if (defined?(JRUBY_VERSION) || ENV['DEBUGGER_MEMORY_LIMIT'].to_i <= 0)
         check_memory_limit = false