Allow using run_java without the arguments from -J -Ja -Jp. Factor out the argument processing of mx_graal.vm and use it to pass tested-vm args down through the jmh harness

function main() {  
  i = 0;  
  while (i < 1000) {
    if (i >= 942) {
      break;
    }  
    i = i + 1;  
  }
  return i;  
}